Answer:
Reproduction, heredity, variation in fitness or organisms.
Explanation:
Evolution occurs in organisms due to natural selection process because natural resources are limited. Evolution is the change in the characteristics of a species over several generations. If evolution occurs in the organisms so these evoluted organisms can survive rate more than those organisms where no evolution occurs because the evoluted organisms can adopt successfully the features of environment. Reproduction, heredity, variation in fitness or organisms are the four factors needed for natural selection to act.
Name and explain each lymph organ.
Explanation:
What are the organs of the immune system?
Publication Details
Our immune system is made up of both individual cells and proteins as well as entire organs and organ systems. The organs of the immune system include skin and mucous membranes, and the organs of the lymphatic system too.
Organs that function as barriers
Your skin and mucous membranes are the first line of defense against germs entering from outside the body. They act as a physical barrier with support from the following:
Antibacterial substances can kill germs right from the start. A certain enzyme found in saliva, the airways and tear fluid destroys the cell walls of bacteria.
Mucus in the bronchi helps trap many of the germs we breathe in so they can be moved out of the airways by hair-like structures called cilia.
Stomach acid stops most of the germs that enter the body in the food we eat.
Harmless bacteria on our skin and many of the mucous membranes in our body also act as part of the immune system.
In addition, the reflexes that cause us to cough and sneeze help to free our airways of germs.
Illustration: The parts of the immune system
The parts of the immune system
Lymphoid organs
The lymphatic system is composed of:
Primary lymphoid organs: These organs include the bone marrow and the thymus. They create special immune system cells called lymphocytes.
Secondary lymphoid organs: These organs include the lymph nodes, the spleen, the tonsils and certain tissue in various mucous membrane layers in the body (for instance in the bowel). It is in these organs where the cells of the immune system do their actual job of fighting off germs and foreign substances.
Bone marrow
Bone marrow is a sponge-like tissue found inside the bones. That is where most immune system cells are produced and then also multiply. These cells move to other organs and tissues through the blood. At birth, many bones contain red bone marrow, which actively creates immune system cells. Over the course of our life, more and more red bone marrow turns into fatty tissue. In adulthood, only a few of our bones still contain red bone marrow, including the ribs, breastbone and the pelvis.
Thymus
The thymus is located behind the breastbone above the heart. This gland-like organ reaches full maturity only in children, and is then slowly transformed to fatty tissue. Special types of immune system cells called thymus cell lymphocytes (T cells) mature in the thymus. Among other tasks, these cells coordinate the processes of the innate and adaptive immune systems. T cells move through the body and constantly monitor the surfaces of all cells for changes.
Lymph nodes
Lymph nodes are small bean-shaped tissues found along the lymphatic vessels. The lymph nodes act as filters. Various immune system cells trap germs in the lymph nodes and activate the creation of special antibodies in the blood. Swollen or painful lymph nodes are a sign that the immune system is active, for example to fight an infection.
Spleen
The spleen is located in the left upper abdomen, beneath the diaphragm, and is responsible for different kinds of jobs:
It stores various immune system cells. When needed, they move through the blood to other organs. Scavenger cells (phagocytes) in the spleen act as a filter for germs that get into the bloodstream.
It breaks down red blood cells (erythrocytes).
It stores and breaks down platelets (thrombocytes), which are responsible for the clotting of blood, among other things.
There is always a lot of blood flowing through the spleen tissue. At the same time this tissue is very soft. In the event of severe injury, for example in an accident, the spleen may rupture easily. Surgery is then usually necessary because otherwise there is a danger of bleeding to death. If the spleen needs to be removed completely, other immune system organs can carry out its roles.
Erosion and deposition work together to
shape Earth's surface. Which of the following
statements best describes deposition?
A. A river flows into an ocean slows and
drops sediment.
B. Rushing water beats against the rocks at
the base of a waterfall.
C. A rushing river spreads out and forms a
wide river valley.
D. Sediment is carried away from the outer
bank of a river.
Answer:
A
Explanation:
Plants make food through photosynthesis, and photosynthesis takes place mostly in plant leaves, but when plants lose their leaves in the winter, they do not die.
This is evidence that
A.
plants can use heat in the ground to make food.
B.
someone gives the plants food every day.
C.
plants store food for later use.
D.
photosynthesis also takes place in plant roots.
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Answer:
Plants, like cacti, don't have leaves in the traditional sense. (Their spines are actually modified leaves.) But the cells in the body or “stem” of the cactus plant still contain chlorophyll. Thus, plants like cacti can absorb and convert energy from the sun through the process of photosynthesis
Explanation:
photosynthesis also takes place in plant roots
cell is discovered by whom
Answer:
Explanation:
Cell is discovered by Robert Hooke.
Answer:
The cell is initially discovered by Robert Hooked in 1665
The population of Dubai at the end of 2012 was 2.1 million. This was predicted to increase at a rate of 6% each year. Calculate the predicted population of Dubai at the end of 2015?
Mathematics
Answer:
2.1×0.06^3= the correct answer
Explanation:
using a compound formula used for interest u can use this to see how the population is increasing by multiplying the principal×rate^time
Answer:
Population at the end of 2015 is 2.5 million.
Explanation:
Population of Dubai at the end of 2012 is 2.1 million.
Rate of increase of population is 6%
Population at the end of 2013 is 2.1 million +(6% of 2.1 million) =2.226 million.
Population at the end of 2014= 2.226 million + 6% of 2.226 million = 2.35956 million.
Population at the end of 2015 is = 2.35956 million + 6% of 2.35956 million = 2.5 million.
Hope this answer helps you :)
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Jena is using a drawing to show how the greenhouse effect works. She uses arrows to depict the movement of
radiation from the sun, through space, and through the Earth system.
Which arrows show how radiation interacts with the greenhouse gases?
A) the arrows from the sun to the Earth's surface and from the Earth's surface to space
B) the arrows from the sun to the atmosphere and from the atmosphere to space
C)the arrows from the Earth's surface to the atmosphere and from the atmosphere to the Earth's
surface
D)the arrows from the sun to the Earth's surface and from the Earth's surface to the underlying
rocks and soil
Answer:
The correct answer is - C. the arrows from the Earth's surface to the atmosphere and from the atmosphere to the Earth's surface.
Explanation:
Interaction between radiation and greenhouse gases can be demonstrated or represented by a model which shows how the radiation from different sources of the earth's surface is released in the atmosphere and how the radiation comes to the earth's surface from the atmosphere of the earth.
The radiation trapped by the greenhouse gases and more infrared radiation will be absorbed and emitted back toward Earth's surface, which affects and show more greenhouse effect.
Define The process of respiration.
Answer:
It is the oxidation of food substances to release energy for metabolic activities
Explanation:
it is a biochemical process which involves the breaking down of food substances by the cell with or without oxygen for metabolic activities
Explanation:
Respiration is defined as a metabolic process wherein, the living cells of an organism obtains energy (in the form of ATP) by taking in oxygen and liberating carbon dioxide from the oxidation of complex organic substances.”
Describe the action of CILIA in the movement of mucus. ANSWER ASAP PLS!!!
Answer:
Motile' (or moving) cilia are found in the lungs, respiratory tract and middle ear. These cilia have a rhythmic waving or beating motion. They work, for instance, to keep the airways clear of mucus and dirt, allowing us to breathe easily and without irritation. They also help propel sperm.
.
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Many years ago a scientist Group E plants that produce wrinkled peas the peas from the plants produce new plants that also produce wrinkled peas the scientist concluded that something in the para plan will be transmitted to the next generation this discovery is known as
Answer:
This discovery is known as heredity.
Explanation:
In the question above, we can see an example of heredity, which is the process where a trait is passed from an ascendant to a descendant. As seen above, the wrinkled seed is a characteristic that was passed on to a plant through its parent, the plant that gave rise to it. The characteristics passed by heredity are transmitted through the continuous transfer of genetic material, present in the DNA. Since the descendants have the DNA of their parents, it is possible that the characteristics are transmitted as the generations advance.
7. Which type of mass movement occurs rapidly
when a single mass of soil and rock suddenly
slips downhill?
A. creep
B. landslide
C.mudslide
D. slump
Answer:
The most destructive type of mass movement is a landslide, which occurs when rock and soil slide quickly down a steep slope. Some landslides may contain huge masses of rock, while others may contain only a small amount of rock and soil. A mudflow is the rapid movement of a mixture of water, rock, and soil.
8. In the food web below, which organism is NOT considered a consumer?
F. Kingfisher
G.Tadpole
H.Algae
J.Snail
Describe the chemical weathering that contributes to
the formation of sinkholes.
Ill mark brainly
Answer:
The correct answer is - rainwater or groundwater form carbonic acid that dissolves sections of bedrock.
Explanation:
A sinkhole is a natural hole or cave-like structure formed on the surface of the due to the chemical weathering of sections of bedrock made of carbonate rocks like limestone, dolomite, as well as salt beds or rocks.
Rainwater or groundwater comes in contact with CO2, a weak acid known as carbonic acid is formed, That can dissolves or weathers the lime stone or the carbonate rock of sections of the bedrocks and makes huge cracks or hollow out vast networks of caves.
Helpppppp! ASAP
What is occurring in the diagram below?
A. Sister chromatids are separating.
B. Alleles are independently assorting.
C. Genes are replicating.
D. Segments of DNA are crossing over.
Answer:
D
Explanation:
The diagram below shows a portion of a chromosome during meiosis. Meiosis is a process of cellular division that produces haploid gametes from diploid cells. The process of meiosis involves two rounds of nuclear division.
What happens in the process of meiosis ?During the first round, homologous chromosomes pair up and exchange genetic material. This process is known as crossing over.
The diagram below shows a section of the chromosome during the first meiotic division. The chromosome is composed of two sister chromatids, which are identical copies of each other.
These sister chromatids are held together by a centromere. At this stage, the sister chromatids are in the process of separating from each other. The arrows indicate the direction of movement of the chromatids as they separate. The diagram also shows a section of the chromosome where the two sister chromatids have already separated.
This section is known as a chiasma, and it is the result of crossing over. During crossing over, segments of DNA from the two homologous chromosomes exchange places. This process creates genetic variation in the gametes, which is important for evolution.
In conclusion, the diagram shows sister chromatids separating, alleles independently assorting, segments of DNA crossing over, but not genes replicating. The correct answer is A. Sister chromatids are separating.
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What is nuclear energy?
A. the energy released in nuclear reactions
B. the energy it takes to bond elements to form compounds
C. the energy holding the particles in a nucleus together
D. the energy that causes the water in a pot on the stove to boil and form steam
Answer:
C
Explanation:
Nuclear energy is the energy in the nucleus, or core, of an atom. Atoms are tiny units that make up all matter in the universe, and energy is what holds the nucleus together. There is a huge amount of energy in an atom's dense nucleus.
please help me will give branlist
Answer:
An outline, and a goal, list of materials, and a set of steps to follow.
Hope that this helps!
Answer:a
Explanation:
Piensa por lo menos dos ejemplos para cada tipo de noxa Biológicas: Físicas: Químicas: Psicosociales
Answer:
A noxa is any component of the natural context, with the ability to generate some harm to the person who touches it.
Explanation:
Any blow with mechanical damage, change in temperature or pressure, UV radiation, plutonium, strontium, X-rays, electricity, loud noises is considered physical noxa.
Examples of this can be: Physical hazards: noise, radiation (ultraviolet, x-rays), electricity, blows, breaks, burns, cuts.
Chemical noxa is toxic and poisons, mostly of exogenous origin, that enter the body accidentally.
Examples of this can be: Chemical noxes: insecticides, pesticides, poisons, toxic gases, co2, co.
Biological noxas are living beings or viruses recognized as pathogenic agents, since they cause diseases of varying symptoms, evolution and severity, but which are called infectious diseases.
Examples of this can be: bacteria, protozoa, fungi and non-cellular entities, such as viruses.
Psychosocial noxas are actions or lack of actions that can cause mental disorders and that can lead to physical problems. Its impact is often negative on general well-being, particularly for young people.
Examples of this can be wars, racism or bullying.
If two populations of people share the same DNA "spelling difference" (i.E., mutation), what does this mean about these two populations?
Answer:
It could mean that those two populations could be common ancestors because the spelling differences are the same
Explanation:
The similar spelling variations between the two populations could imply that they share common ancestry.
What is DNA?Deoxyribonucleic acid, or DNA, is the name given to the genetic material carried by humans and nearly all other species. An individual's DNA is present in nearly all of their cells.
Nucleotides are the molecular building components that make up DNA. A phosphate group, a sugar group, and one of four different nitrogen bases make up these building components. Nucleotides are joined into chains and the locations of the phosphate and sugar groups are switched to form DNA strands.
Every cell in the body has DNA in its nucleus. Groups of these firmly bound fragments make form chromosomes. The majority of people possess 46 pairs of chromosomes, or 23 pairs per pair.
Thus, The similar spelling variations between the two populations.
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1.What is the most variable class of RNA?
2.What is the main function of mRNA?
Answer:
1. mRNA
Explanation:
2. messenger RNA (mRNA) carries the protein blueprint from a cell's DNA to its ribosomes, which are the "machines" that drive protein synthesis.
Which of the following is an example of current electricity?
A.
hair standing on end on a dry day
B.
a balloon sticking to a wall
C.
a charged cloud
D.
a lit flashlight
PLEASE DO NOT ANSWER IF YOU DO NOT KNOW
Examine the model here. Which statements about the behavior of light shown in the model are supported by the image? Select
ALL that apply.
A)
Red light is reflected by the material.
B)
Blue light is absorbed by the material.
Red light is refracted by the material
D)
Green light is absorbed by the material
E)
Blue and green light have less energy than red light.
Answer:
A, B, and D
Explanation:
Red light is reflected by the material.
Green light is absorbed by the material.
Blue light is absorbed by the material.
According to the model, red is not absorbed, which means it is reflected. It cannot pass through nor is it absorbed. Blue light and green light do not pass through, but they are not reflected either. This is called absorption.
Pls help with this question (I will mark brainliest)
Answer:
B
Explanation:
Genes have to do with your traits or what genetics you have. They can be inherited by parents, or grandparents. Genes are the expression of a trait.
Which is a false statement concerning photosynthesis and aerobic respiration?
A. Both occur in specific organelles
B. Both release oxygen as an end product
C. Both require ATP
D. Both involve the movement of electrons in transport chains
E. Both occur inside the cell
Answer: B is wrong
Explanation: Aerobic respiration needs oxygen
2) Which of these would best explain why the microbial population
begins to decrease after a period of time?
A) organisms moved away to find new mates
B)
extra food was introduced into the area
the graph actually never shows the population
decreasing
D)
organisms began to die as the population was larger
than could be supported by the limiting factors
Answer: D.) organisms began to die as the population was larger than could be supported by the limiting factors
Explanation: i just took this assessment :)
The best explanation for the microbial population beginning to decrease after a period of time is that organisms began to die as the population was larger than could be supported by limiting factors. The correct option is D).
What is the population?Applying population ecology and population genetics to study the ecology and evolution of bacteria, archaebacteria, microscopic fungi (like yeasts), and other microscopic eukaryotes is known as microbial population biology.
The evolution of the bacterial population. Growth starts out exponential. After that, the population curve levels off, which most likely denotes the population's carrying capacity. A drop in the microbial population is then shown by the curve's downward bend. Numerous causes, both density-dependent and density-independent, can be blamed for the drop.
Therefore, the correct option is D) organisms began to die as the population was larger than could be supported by the limiting factors.
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what is myogenic heart? give one example
Answer:
The myogenic heart is the characteristics of vertebrates where continuous rhythmic contraction occurs. The myogenic heart is the intrinsic property of the cardiac muscles. Each contraction of the heart muscle regulates the flow of blood in the form of a pulse or heart rate.
Explanation:
i hope its helps
Does grain size determine the porosity of a sediment type?
Answer:
Yes
Explanation:
In sediments or sedimentary rocks the porosity depends on grain size, the shapes of the grains, and the degree of sorting, and the degree of cementation. Well-rounded coarse-grained sediments usually have higher porosity than fine-grained sediments, because the grains do not fit together well
You are replicating Gregor Mendel’s famous experiment with sweet peas.
The genotype for dominant smooth-seeded parent is designated AA, while
the genotype for the wrinkled-seeded parent is aa. Using a punnet square
predict the first generation for this cross. What are the genotypic and
phenotypic ratios? SHOW ALL WORK.
I WILL GIVE BRAINLEST ANSWER IF SOMEONE COULD SOLVE THIS OUT FOR ME PLEASE I NEED IT ASAP!!!! DUE IN 30 MINS!!!!!!!!
Answer:
answer is in the picture above
I A segment of a DNA molecule unzips, revealing a instructions in a for that protein. with the
Calculate the weight of an object of 30 kg on Earth. 2. Calculate the weight of an object of 30000 g on Earth. 3. Calculate the weight of an object of 2 kg on Earth. 4. Calculate the weight of an object of 2000 g on Earth. 5. Calculate the weight of an object of 0.5 kg on Earth. 6. Calculate the weight of an object of 500 g on Earth. 7. Calculate the weight of an object of 50 kg on the Moon (gravity of 1.6 m/s2) 8. Calculate the weight of an object of 50 kg on Mars (gravity of 3.7 m/s2)
Answer:
1. 294N
2. 294N
3. 19.6N
4. 19.6N
5. 4.9N
6. 4.9N
7. 80N
8. 185N
Explanation:
The weight of an object is the force that gravity is having over it, and we measure it in Neutowns (N), which equals Kg x m/s².
To find the weight of an object, we use the formula F= m x g.
F stands for force, m for the object's mass, and g for gravity, which is the force that attracts objects to Earth, and we measure it by the acceleration that an object has during free falling.
The Earth's gravity is 9.8 m/s²
1. We use the formula F=m x g
F= 30kg x 9.8 m/s²
F= 294 N
2. We have to convert the 30000g into kg to use the formula
30000÷1000= 30kg
30000g equals to 30Kg, so the object's mass (m) is 30Kg.
F= m X g
F= 30kg X 9.8 m/s²
F= 294 N
3. F= m X g
F= 2kg X 9.8 m/s²
F= 19.6 N
4.We have to convert the 2000g into Kg.
2000÷1000= 2Kg
The object's mass (m) is 2Kg.
F= m X g
F= 2kg X 9.8 m/s²
F= 19.6 N
5. F= m X g
F= 0.5 kg X 9.8 m/s²
F= 4.9 N
6.We have to convert 500g to Kg.
500g÷1000=0.5Kg
The object's mass (m) is 0.5 kg
F= m X g
F= 0.5 Kg X 9.8 m/s²
F= 4.9 N
7. The gravity on the moon is different from the one on Earth. In the formula, instead of 9.8 m/s² for the gravity (g), we use 1.6 m/s².
F= m X g
F= 50Kg X 1.6m/s²
F= 80N
8. The gravity (g) on Mars is 3.7 m/s², so we have to use it in the formula where it says g to find the object's weight on Mars
F= 50Kg X 3.7m/s²
F= 185 N
Measurement needed in children's wear?
need kopo ng answer agad:)
Answer:
Height
Chest/Bust
Waist
Hips
Inside Leg
plants that posses plant organs are called?