Throughout the course of evolution, organelles such as mitochondria and chloroplasts (a form of plastid) may have arisen from engulfed prokaryotes.
the structure that separates the cochlear duct from the tympanic duct is the
Answer:
the basilar membrane
Explanation:
The tympanic duct or scala tympani is one of the perilymph-filled cavities in the inner ear of humans. It is separated from the cochlear duct by the basilar membrane, and it extends from the round window to the helicotrema, where it continues as vestibular duct.
cells in your reproductive organs(ovaries and testes)that develop into eggs or sperm
germ cells
body cells
somatic cells
meiosis
Answer:
Somatic cells or meiosis
Explanation:
please help will give brainliest
Answer:
Explanation:
You are learning about mimicry in entomology. Which microscope would be best to look at the wings of two different butterflies to determine which is a Monarch Butterfly and which is a Viceroy Butterfly?
The greatest tool to use to compare the wings of two distinct butterflies and identify which is a Viceroy butterfly and which is a Monarch butterfly is a scanning electron microscope, hence option C is correct.
What is a scanning electron microscope?A focused stream of electrons is used by an electron microscope known as a scanning electron microscope (SEM) to scan a sample's surface and produce images of the material.
Various signals that reveal information about the sample's surface topography and composition appear as the electrons make contact with the sample's atoms.
The electron beam is scanned using a raster scan pattern, and an image is produced by fusing the position of the beam with the intensity of the signal that is detected.
Therefore, to compare the wings of two distinct butterflies and identify which is a Viceroy butterfly and which is a Monarch butterfly with a scanning electron microscope, hence option C is correct.
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The given question is incomplete, so the complete question is,
You are learning about mimicry in entomology. Which microscope would be best to look at the wing of two different butterflies to determine which i a Monarch Butterfly and which I a Viceroy Butterfly?
compound microscope
dissection microscope
scanning electron microscope
tranmiion electron microcope
a scientific study shows that for every 1 hour of studying that a student does their grade on the test improves by 20% what is the independent variable
Which of the following situations
demonstrates a chemical change?
A. wood turning to ashes as it burn's
B. ice forming when water is placed in a freezer
C. sugar dissolving in a glass of hot
tea
D. a board becoming smooth as it is sanded
To test a new drug that has the potential of curing people of the common
cold a company asked human volunteers who were coughing and sneezing
to participate in a clinical study. The objective of the experiment was to test
whether the new drug could cure the volunteers in the experimental group of
the common cold. But instead of two groups, these volunteers were randomly
divided into three groups and treated as follows:
Group
Experimental
Group
Yes
Control
Group 1
NO
Control
Group 2
No
New ONS
Orange
Bedre
Yes
No
Yes
Yes
Which of the following is the best explanation of why a second control group
was included in this experiment?
O A To prove that the common cold cannot be cured
B. To provide the volunteers in the study with something to drink
O C. To help researchers conclude that results are related to the new
drug and not to the orange juice
O D. To confuse anyone who is trying to steal their new drug and sell it
as their own invention
Answer: C
Explanation: A good experiment does everything it can to eliminate confounding, or the influence of external sources on the data being measured. Orange juice could be a factor that plays a role in curing the symptoms, so provide a group with and without orange juice gives you the ability to show that the influence of orange juices didn’t have an effect on the cold, or did, but it gives you a baseline to show the effects of the medicine with and without orange juices.
Which is a part of the process of speciation?
A. Increased gene flow
B. Interbreeding between species
C. Fixing alleles
D. Divergence
According to the research, divergence is a part of the process of speciation.
What is divergence?It is the process of speciation in which two closely related species evolve by changing a common ancestral structure in different ways.
In other words, starting from an ancestral structure, different species evolved by adapting to their environment and their needs.
Therefore, we can conclude that according to the research, divergence is a part of the process of speciation.
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Active transport moves molecules from and to which concentration?
A: high to low
B: low to high
C: low to lower
Option (B) low to high is right Answer
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We know that, Active transport moves ions and molecules across a membrane against the concentration gradient. It requires energy.
The characteristic features of active transport are:
-The movement of molecules in case of active transport is from lower concentration to higher concentration so it shows uphill transport.
-These have carrier proteins that are highly specific like enzymes for the substances to be carried across the membrane.
-The process of active transport can be inhibited by inhibitors that react with the protein side chains.
-The transport rate reaches its maximum when all the protein carriers are in use or get saturated with the substances to be carried.
The various types of processes that depend on active transport are:
-Absorption of amino acids from the gut.
-Absorption of mineral ions by plant roots.
-Excretion of urea and hydrogen ions by the mammalian kidney.
-Exchange of sodium and potassium ions in nerve cells.
-Filling of the contractile vacuole in amoeba.
The phloem in the leaves of a plant is rich in sugars because of the high rate of active transport.
Additional information :- Some intrinsic protein molecules function as molecular pumps. These permit the cell to go for active transport to accumulate glucose or ions against the concentration gradient. Cells that undergo active transport have abundant mitochondria that provide ATP needed to power active transport.▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
Cheers :))
What normally happens immediately after fertilization in sexual reproduction?
A) drsion of cells resulbng in the development of an embryo from a zygote
B) production of daughter cells having half the number of chromosomes as the parent cell
C) production of daughter cells having twice the number of chromosomes as the parent cell
D) Specialization of cells to form a fetus from an egg
Answer:I don’t know this one.
Explanation:but it should be a
Division of cells resulting in the development of an embryo from a zygote happens after fertilization. Therefore, option "A" is correct.
What is fertilisation?The creation of a single cell known as a zygote by the fusion of a female gamete is egg and a male gamete a sperm. The biological process of fertilization in animals entails the union of a sperm as the male gamete and an egg as the female gamete or ovum.
The three techniques of internal fertilization are oviparity is an egg deposited outside of the female body, oviparity is an egg kept within the female, and viviparity is said to be developed within the female followed by live delivery.
Therefore, fertilization is the first step in the development of the zygote and the development of life.
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A population of rhinos in Africa is 112. this year there were 17 births and eight deaths in the population. What is the change in population? Do we have a positive, negative, or zero change in population? How many members are in the new population?
Answer should contain the following information: work for calculating the change in population positive, negative, or zero change in population. work for calculating the new population
Explanation:
Why anti-poaching?Rhinos have inhabited the African continent for over a million years and they play a huge role in their ecosystems. The illegal trade in powders made from their horns, which in some countries in Asia is still considered a medicine or simply a symbol of wealth, nearly led to the extinction of the African rhino.
In 1875, there were still more than 1,000,000 rhinos living in the vast grasslands of Africa. Today the populations of the two species of black rhino and white rhino are estimated to contain about 5,000 and 20,000 animals respectively. The senseless killings continue. Since 2007, the number of rhinos hunted in Africa has increased by almost 9,000%.
It is therefore our call to stop the slaughter of rhinos with all our might.
How do plants help prevent erosion?
a) Plant leaves take in carbon dioxide during photosynthesis.
b) Plant leaves are used to create fabrics and other materials.
c) Plant roots help to hold soil in place.
d) Plant roots absorb water from the ground.
PLS HELP ILL GIVE BRAILYEST AND 100PTSPLS HELP ME
Select the correct location on the image.
Where is the protective covering of the axon?
Answer: myelin sheath
Explanation:
The axon is covered by a myelin sheath. The axon passes information to the next neuron or other cell in the body. A myelin sheath.
what hormone makes girls emotional on their period
Answer:
estrogen and progesterone
Explanation:
both are the major hormones for emotional and physical changes
mitosis is the only type of cellular division in which:
Answer:
itosis is a process where a single cell divides into two identical daughter cells.
Explanation:
Mitosis is the only type of cellular division in which number of chromosomes is maintained
What is mitosis?During the phase of the cell cycle known as mitosis, duplicated chromosomes are physically split in half to form two new nuclei. Mitosis is a method of cell division that results in the production of cells that are genetically similar and in which the total number of chromosomes is preserved. Since this occurs during mitosis, the process is often referred to as equational division.
Mitosis serves a very vital purpose in living creatures, and one of its functions is the regeneration and replacement of worn-out and damaged tissues. Mitosis contributes to the generation of identical copies of cells and, as a result, assists in the process of healing damaged tissue or replacing cells that have been worn out.
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what is amino acid?
Answer:
The word amino acid is short for carboxylic acid. And that is what amino acid is, an organic acidic carboxylic group, and that every molecule has a central carbon with a carboxylic group attached to it.
Explanation:
Hope this help!
Under which conditions would air hold less water vapor than it holds at 30°C
(86°F) with sunny skies?
A. 34°C (94°F) with cloudy skies
B. 30°C (86°F) with cloudy skies
C. 22°C (86°F) with sunny skies
D. 32°C (90°F) with sunny skies
Answer:
B
Explanation:
jus CS its right
The relative humidity of the air affects how much water vapor it can hold. 30°C (86°F) with cloudy skies would air hold less water vapor than it holds at 30°C (86°F) with sunny skies. So, the correct option is B.
What is Relative humidity?Relative humidity (RH) measures the amount of moisture in the air compared to the maximum amount of moisture in the air at a given temperature and pressure. It is a standard figure for describing the moisture content of the air and is expressed as a percentage.
At a given temperature and pressure, air is considered to have 100% relative humidity when it contains all the moisture it can hold. The temperature at which the moisture in the air begins to condense into droplets is known as the dew point.
Therefore, the correct option is B.
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when a stem cell differentiates and changes in size and shape
Microevolution occurs when what kind of frequencies change?
Which one of the following disease is caused by a protozoa?
a.Kala-azar
b.Sleeping sickness
c.Rabies
d. both a and b
Answer:
D: Both A and B.
help me pls ASAP it's need
Answer:
slash and burn methods results in soil erosion due to the fact that it causes landslides, dust clouds and contaminated water. Soil washes away during rain and trees are no longer supported by the soil holding their roots in place
How do mangroves and coral reefs show mutual relationship?
Answer:
The answers below⤵
Explanation:
Mangroves serve as a shoreline protection.
Oil refining is an example of:
Construction Production
Extractive Production
Domestic Production
Traditional Production
Answer:
i think its the first one
Explanation:
explain what a species is and how resources lead to species biodiversity.
Species are organisms which have similar characteristics and are capable
of interbreeding. A common example is we human beings.
Resources leads to species biodiversity as a result of organisms moving
from one place to another in search of food for its survival. The availability
of resources will lead to an increase in reproduction and species
biodiversity as more organisms will be present in the area.
Scarcity of resources on the other hand results to lower species biodiversity
and decreased reproduction rate.
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Explain the difference between afferent and efferent neurons.
Answer:
The Difference between Afferent and Efferent Neurons :- Neurons that receive information from our sensory organs (e.g. eye, skin) and transmit this input to the central nervous system are called afferent neurons. Neurons that send impulses from the central nervous system to your limbs and organs are called efferent neurons.Hope this helps you XD !!!Explain the idea of Nature vs. Nurture in your own words.
Nature vs. Nurture both influence the observed traits of an organism.
The controversy between nature and nurture have been an ongoing discourse for many years. It is believed that the traits of an organism are dependent on genes inherited from the parents. Another school of thought believes that environment alone has the sole influence over the traits of an organism.
However, most scientists today are of the opinion that the influence of nature and nurture are intertwined and they both work together to influence the traits exhibited by any organism.
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2.what type of ends do the enzymes bamhi and ecori produce? how does this type of end facilitate cloning?
Answer:
The enzymes BamHI and EcoRI form double bonds and produce sticky ends that facilitate the cloning process. The plasmid DNA can be linked by DNA ligase in the correct orientation in the host genomic DNA.
Explanation:
tRNA:
a) helps to translate codons to DNA
b) transfers anticodons to rRNA
c) recognizes anticodons in the mRNA
d) joins one specific amino acid
Answer:
A transfer RNA (abbreviated tRNA and formerly referred to as sRNA, for soluble RNA) is an adaptor molecule composed of RNA, typically 76 to 90 nucleotides in length (in eukaryotes), that serves as the physical link between the mRNA and the amino acid sequence of proteins. Transfer RNA (tRNA) does this by carrying an amino acid to the protein
Explanation:
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Answer:
D
Explanation:
Hope this helps
Answer:
I'm pretty sure its D - hibernation
Explanation:
Torpor means a state of physical or mental inactivity, or lethargy.
Hibernation means an extended period of inactivity.
They are both used for survival in cold weather.
Cortical nephrons have their corpuscles near the _________ edge of the cortex and are the ______ common type of nephron.
Answer: the first is Peripheral and the second blank is more