Answer:
The correct answer is - Africa.
Explanation:
Scientists found the fossils of modern humans called Mota an ancient man who lived around 40000 to 45000 years ago in Ethiopia. It was the first DNA isolated from Africa.
This DNA sample says that the Europeans have 6% of the DNA of this modern human, which suggests that there was substantial migration of people into Africa from Europe and the middle east by water crossings.
1, name the part of the reproductive system in which fertilisation happens.
2, what is an embryo
3, where does the embryo develop into a foetus, and then a baby
4, why does the uterus lining start to grow thick and spongy, as an egg cell develops in an ovary
5, what happens to the uterus lining if the egg cell is not fertilised
6, how often does an egg cell leave an ovary, in an adult woman
7, how often does menstruation happen, in an adult woman
Answer:
°•°
Explanation:
1.fallopian tube
2.an unborn or unhatched offspring in the process of development, in particular a human offspring during the period from approximately the second to the eighth week after fertilization (after which it is usually termed a fetus)
3.First, the zygote becomes a solid ball of cells. Then it becomes a hollow ball of cells called a blastocyst. Inside the uterus, the blastocyst implants in the wall of the uterus, where it develops into an embryo attached to a placenta and surrounded by fluid-filled membranes.
4.Eggs live in ovaries, and the hormones that control your menstrual cycle cause a few eggs to mature every month. When your egg is mature, it means it's ready to be fertilized by a sperm cell. These hormones also make the lining of your uterus thick and spongy, which gets your body ready for pregnancy.
5.The fertilized egg attaches to the lining of the uterus. The placenta then develops. The placenta transfers nutrition and oxygen to the fetus from mother. If the egg does not become fertilized, the lining of the uterus (endometrium) is shed during menstruation.
6.The egg cell travels down the fallopian tube into the uterus. The moment the egg cell leaves the ovary is called ovulation. Once a girl has had her first monthly period, ovulation usually occurs once a month
7.The average menstrual cycle is 28 days long. Cycles can range anywhere from 21 to 35 days in adults and from 21 to 45 days in young teens. The rise and fall of levels of hormones during the month control the menstrual cycle.
Drag a number and symbol to represent the amount of time Carl worked on problems.
___ ___ ____
Answer:
25 - m
Explanation:
If Carl worked m less than 25, 25 - m would represent the amount of time Davis worked minus the difference in the amount of time that he and Carl worked, which would equal the amount of time Carl worked.
Sometimes an organ can be replaced by moving it from one part of the body to another. This can be done, for example, to replace damaged skin or joints. In these cases: antigens would be generated against the transplanted organ. rejection of the transplanted organ would still be expected. antibodies would be generated against the transplanted organ. rejection of the transplanted organ would not be expected. immunosuppressant drugs would be required to prevent transplant rejection.
Answer:
rejection of the transplanted organ would not be expected
Explanation:
Transplantation refers to 1-the movement of an organ/tissue/cells from one part of a person's body to another part, and 2-the movement of an organ/tissue/cells from one individual (donor) to another individual (recipient). An autograft is a type of transplant by which a patient receives his/her own tissue. For example, a skin autograft consists of a patch of skin that is removed from one area of the body and transplanted to another body region of the same individual. Skin autograft is a relatively common transplantation process used to repair wounds and restore skin function. In rats, the mechanism of skin autograft rejection has been reported as uncertain. Moreover, transplant rejection is a natural mechanism by which the immune system of a person does not recognize the transplant as its own, thereby attacking the transplanted organ/tissue. The autograft rejection reactions are relatively uncommon but they depend on the type of organ/tissue/cells to be transplanted.
Processing Minerals and Metals
10.
Organize Information Fill in the flowchart with the main steps involved in
processing minerals,
Minerals are
removed from
the ground
11. Why are minerals processed?
12. What are tailings, and why are they so controversial?
Answer:
To remove impurities.
Explanation:
Minerals are processed in order to remove impurities from the minerals as well as getting clean minerals. If the minerals are not clean from impurities, it can't be used in the manufacturing of other products. Tailings are the materials that left over after the process of separating the mineral from the uneconomic fraction or residue of an ore. Tailing stored in water can be dangerous sources of toxic chemicals, such as heavy metals, sulfides and radioactive content that can adversely affected the biotic or living part of water.
Which organism diverged first?? *
Birds
Sharks
Rabbits
Primates
Chemicals and hazardous substances controlled by the Toxic Substances Control Act (TSCA) include all of the following except _____.
polychlorinated biphenyls
bisphenate
radon
asbestos
Answer:
Chemicals and hazardous substances controlled by the Toxic Substances Control Act (TSCA) include all of the following except
bisphenate.
Chemicals and hazardous substances controlled by the Toxic Substances Control Act (TSCA) include all of the following except _____.
polychlorinated biphenyls
bisphenate✓
There are 6 chemical substances which are controlled by TSCA and bisphenate isn't one of them. It's use to manufacture hard core plasticradon
asbestos
what is the relation between chromatin ,dna,gene,chromosome?pls answer in simple words
Answer:
The main difference between chromatin and chromosome is that chromatin consists of the unravelled condensed structure of DNA for the purpose of packaging into the nucleus whereas chromosome consists of the highest condensed structure of the DNA doublehelix for the proper separation of the genetic material between
There are three basic crystal structures. O False; There are 12 basic crystal structures. False; There are 4 basic crystal structures. True False; There are 6 basic crystal structures.
Answer:
true
Explanation:
triclinic, monoclinic, orthorhombic, tetragonal, hexagonal, and cubic.
have a nice day/night
may i please have a branlliest
How are primary and secondary succession similar and how are they different?
Answer:
They are similar in that both involve the growth of new organisms in an environment. However they differ in that primary succession occurs in a place where no life had been before, while secondary succession occurs in place where life had been before, but was destroyed.
Some examples of primary succession include the formation of a new ecosystem after a volcano, glacier outbursts, or a nuclear explosion. Some examples of secondary succession include succession after fire, harvesting, logging, or abandonment of land or the renewal after a disease outbreak.
Answer:
In primary succession, newly exposed or newly formed rock is colonized by living things for the first time. In secondary succession, an area that was previously occupied by living things is disturbed, then re-colonized following the disturbance.
put the following in order from largest to smallest cell nucleus, gene, chromosome,
Answer:
Cell, nucleus, chromosome, gene
Answer:
Nucleotide, Gene, DNA, Chromosome, Nucleus, Cell, Organism.
hope this helps
On a distance-time graph, a car standing still is shown with ____.
A. line curving down
B. line curving up
C. straight, horizontal line
D. series of dots getting closer together
(science)
Answer:
yess i think it is c as well
Explanation:
hope you have a great day
Gaining Insight into Depositional Environments of Sedimentary Rocks
Name: ________ Course:____________
Section:_______ Date:_____________
Sedimentary structures, fossils, cements, and other features of sedimentary rocks provide insight into the environment in which the sediment was deposited.
Match each of the features in the left-hand column to an aspect of the depositional environment listed in the right-hand column by placing the corresponding letter in the proper blank.
Rock and/or feature of the rock
(a) poorly sorted arkose
(b) contains fossils of intact coral
(c) red mudstone containing dinosaur footprints
(d) black shale containing some pyrite crystals
(e) sandstone containing symmetrical ripples
(f) cross-bedded sandstone
(g) contains > 50% carbon and fossil leaves
(h) contains large, rounded pebbles and cobbles (contains fossils of feathers G very angular grains
Aspect of the depositional environment
1. deposited in a desert dune or in a current
2. formed from sediments accumulated in a swamp
3. deposited in very quiet (stagnant) water
4. deposited in an anoxic marine setting
5. deposited by a swiftly moving stream
6. formed from warm-water, shallow marine reef
7. has not undergone a lot of transport immature,
8. deposited close to the source
9. formed from terrestrial mud (riverbank deposits)
10. deposited on a beach
Answer:
(a): 7. and 8.
(b): 6.
(c): 9.
(d): 4.
(e): 10
(f): 1.
(g): 2.
(h): 5. and 3.
Explanation:
Sedimentary rocks are rocks generated from pre-existing rocks and/or once-living organisms. Arkose is a type of sandstone rich in feldspar (at least 25% of this mineral). Moreover, a rock containing coral fossils indicates that its depositional environment was located in warm tropical reef waters. Mudstone is a kind of sedimentary rock composed of clay (in this case, sediments continued to be deposited above the dinosaur footprints). The black shales are fine-grained sedimentary rocks composed of a mixture of clay (in this case, the pyrite crystals are used as an indicator of low oxygen). Symmetrical ripple marks in the sandstone indicate a marine environment where water motion was dominated by wave oscillations. Cross-bedding is a common structure of sedimentary rocks that form during deposition on inclined surfaces of bedforms (e.g., ripples and dunes). Sediment deposition in swamps is usually heavily vegetated and therefore they are rich in organic matter, while deeper swamp sediments are generally anoxic. Finally, cobblestones are naturally occurring cobble-sized stones formed from the flow of water and gathered from stream beds, while pebblestones are formed when water bodies hit the giant rocks in the rivers and lakes.
What property allows
water to dissolve a
variety of other
substances?
A. transparency
B. high specific heat capacity
C. the density of the water
D. ability to act as a universal
solvent
Answer:
Ability to act as a universal solvent
Explanation:
All other properties are unrelated to how water performs as a solvent and a component within solutions.
How many chromosomes does this cell have?
Answer:
6...
Explanation:
How are Photosynthesis and Cellular Respiration Cycles connected?
1)The products of one cycle become the reactants of the other.
2)The sun provides energy for both photosynthesis and respiration.
3)Photosynthesis and respiration both take place in the mitochondria.
4)Animals eat plants for food and then do not need to perform respiration
A red blood cell (RBC) enters the cranial vena cava of a dog and makes its way to the femoral artery of the dog. Choose the correct number corresponding to each component of the circulatory system that the RBC would encounter on its journey.
1. Lungs
Would not be included on this journey by the RBC
2. Right atrium
Would not be included on this journey by the RBC
3. Aorta
Would not be included on this journey by the RBC
4. Right ventricle
Would not be included on this journey by the RBC
5. Left atrium
Would not be included on this journey by the RBC
6. Carotid artery
Would not be included on this journey by the RBC
7. Pulmonary artery
Would not be included on this journey by the RBC
8. Left ventricle
Would not be included on this journey by the RBC
9. Pulmonary vein
Would not be included on this journey by the RBC
i. 3
ii. 1
iii. 6
iv. 2
v. 8
vi. 4
vii. 5
viii. 7
Answer:iii. 6
Explanation: the RBC will enter from the superior vena cava into the right atrium then enters the right ventricle. Then it goes into the lungs through pulmonary artery from lungs it enters the left atrium through pulmonary vein and then enters the left ventricles and from left ventricles it enters the aorta.
19. If you discovered a large deposit (layer) of organic sedimentary rock
mountain, what would this indicate to you about the mountain's past history?
What is accomplished during meiosis 1
Answer: However, Meiosis I begins with one diploid cell and ends with two haploid cells, halving the number of chromosomes in each cell.
Explanation:
How can human beings work to combat and reduce the many negative impacts to the planet?
I
Answer:
Use more renewable resources (solar, wind, hydroelectric, etc) and fewer fossil fuels (coal, petroleum, and natural gas), since fossil fuels produce a lot of carbon dioxide Eat less livestock (farm animals, such as cows, produce a lot of methane and waste) and possibly become vegetarian/vegan Decrease deforestation (trees absorb carbon dioxide and release oxygen)Recycle/reuse more items to decrease the amount of trash in oceans, forests, and other ecosystemsWhy is she keeping the dead animals?
Answer: i dont know
Explanation: maybe there is something very special about it
Transcriptional termination by RNA polymerase is favored when tryptophan levels are low (1) / high (2), because the low levels (3) / abundance (4) of charged Trp-tRNATrp causes the ribosome to quickly synthesize the leader polypeptide (5) / stall at the pair of Trp codons (6). This termination (7) / elongation (8) structure forms because the 3-4 stem loop (9) / the ribosome (10) allows region 2 to pair with region 3.
a. 1,3,6,8,9.
b. 2,3,5,8,9.
c. 1,4,6,7,10.
d. 2.4,5,8,10.
e. 2.4.5.7.9.
Answer:
The answer is "Choice e".
Explanation:
The additional Trp Operon function is gene expression attenuation. If tryptophan levels are high, RNA Polymerase endings of glutamate operone are favoured, since the excess of Trp-tRNATrp load causes rna to rapidly synthesise the lead polyprotein and region iii base pairs with cluster 4 and creates stepping chain structures which signal mrna cessation. Rest both options are wrong in regards to the glutamate operon amplification transmission termination mechanism.
identify examples of RRAD from the process of photosynthesis
Answer.....
Explanation:
Which of the following are the products of respiration?
1)ATP, Water, and Oxygen
2)Carbon dioxide, Oxygen, and Water
3)ATP, Carbon Dioxide, and Water
4)Glucose, Water, and Carbon Dioxide
Enter the symbolic notation for the atom with 15 protons and 17 neutrons.
Express your answer as an isotope.
Answer:
I think it would be chlorine
Explanation:
because chlorine has 15 protons and 17 neutrons
what is the role that humans play in artificial selection
Answer is there options if not then i think it would be so then they can reproduce for offsprings to greater the population.
Explanation:
pls mark brainlies
a scientist is comparing the outer layer of an onion cell to the outer layer of a human skin cell. what is unique about the outer layer of the onion cell compared to the skin cell?
a. it contains proteins.
b. it contains cellulose.
c. it contains carbohydrates.
d. it is selectively permeable.
The outer layer of the onion cell contains cellulose as compared to the skin cell, hence option B is correct.
What is cellulose?3,000 or more glucose molecules make up the complex carbohydrate or polysaccharide known as cellulose.
The most prevalent of all naturally occurring organic substances, cellulose is the fundamental structural element of plant cell walls and makes up about 33% of all vegetable matter (it makes up 90% of cotton and 50% of wood).
The majority of all naturally occurring organic materials are composed of cellulose, which makes up roughly 33%, 50%, and 90% of all vegetative plants, cotton, and wood, accordingly.
Therefore, it decides the shape of the plant and enables the plant to grow upright, cellulose gives plant cells their stiffness, hence option B is correct.
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Please help!!! 15 points to whoever answers, and brainliest to the best answer!
The process of cellular respiration occurs in the mitochondria of eukaryotic cells. Write the chemical equation for cellular respiration.
Answer:
C6H12O6 + 6O2 → 6CO2 + 6H2O
Explanation:
what ia aruminant animal
Answer:
Ruminants include cattle, sheep, goats, buffalo, deer, elk, giraffes and camels. These animals all have a digestive system that is uniquely different from our own. Instead of one compartment to the stomach they have four. Of the four compartments the rumen is the largest section and the main digestive centre
What is the estimated number of galaxies in the universe? What is the average number of stars in each galaxy?
Answer:
about 100 billion galaxies in the observable cosmos. Each galaxy would have about 100 billion stars on average, and stars typically have roughly 10 planets, and hundreds or thousands of asteroids and comets
Answer:
100 billion stars and 100 billion galaxies
Explanation:
what seven elements have the appearance and properties of a metal but behave like the non-metal in certain situations?
Answer:
i. boron
ii. silicon
iii. germanium
iv. arsenic
v. antimony
vi. tellurium
vii. polonium
Explanation:
Elements that have appearance and properties of a metal but behave like non-metal in certain conditions are called semi-metals or metalloids. On the periodic table, they are found between metals and non-metals. Examples are astatine, polonium, tellurium, antimony, arsenic, germanium, silicon, boron.
Some of their properties that make them look like metals are:
i. They exist as solids at room temperature.
ii. They are shiny.
iii. They are ductile.
Some of their properties that make them look like non-metals are:
i. They are brittle.
ii. Not very good conductor of electricity compared to metals.
The seven elements have the appearance and properties of metal but behave like non-metal in certain situations.
I. boron
ii. silicon
iii. germanium
iv. arsenic
v. antimony
vi. tellurium
vii. polonium
Elements which have look and residences of a steel however behave like non-steel in sure situations are referred to as semi-metals or metalloids. On the periodic table, they're determined among metals and non-metals. Examples are astatine, polonium, tellurium, antimony,arsenic, germanium, silicon, and boron.
Some in their residences that cause them to seem like metals are:
i. They exist as solids at room temperature.
ii. They are shiny.
iii. They are ductile.
Some in their residences that cause them to seem like non-metals are:
i. They are brittle.
ii. Not an excellent conductor of strength in comparison to metals.
What are metals?
Metals are opaque, lustrous factors that might be the right conductors of warmth and electricity. Most metals are malleable and ductile and are, in general, denser than the opposite elemental substances.
Thus it is clear that the above answers are well explained.
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