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Sonja [21]
3 years ago
9

Is it possible to be a chordate and not have a backbone

Biology
1 answer:
tatuchka [14]3 years ago
7 0
No it’s not possible....
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Groundwater _____. A)exists above the earth's surface B)is impossible to pollute C)forms when precipitation seeps into the soil
kirill [66]

Answer: C

Explanation: It isn't impossible to pollute and it is a usable water source AKA wells

8 0
3 years ago
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A letter about the evidence of evolution
GuDViN [60]

Answer:

I am writing this in response to a letter regarding evolution. Evolution is increasingly solid, not shaky. Darwin’s “theory” or explanation was a way of understanding what he had discovered (which did not include genes, chromosomes, DNA or nucleotide bases). Our explanations now include genetics and the commonality of mutation.  

Proofs are solid, not in question by serious scientists. Direct observation is one, which we see in the fact that this year’s flu evolved a little too far from last year’s, so flu shots are less effective this year than we would like them to be.  

Fossils tell the story well: whales with legs, dinosaurs with feathers and Tiktaalik. The latter was found in the Canadian north and is part fish, part amphibian, before there were ever any amphibians. Imperfection is a good proof: think of your useless appendix, the very bad design of your ankles, knees, and back (talk to a chiropractor about that).  You have big toes because they used to be useful thumbs for your grasping feet.

Many other animals and even plants similarly have flaws that show their evolutionary past. Two large human chromosomes reflect the coming together of two chimpanzee chromosomes each.

Hope it helps,

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5 0
3 years ago
Which conditions are possible reasons for declining genetic diversity of a species?
maw [93]

Answer: I would say inbreeding

Explanation:

Inbreeding can cause offspring to have impaired ability to survive and reproduce, as they can inherit harmful mutations. They have a lesser chance of survival than other individuals in their species who are not products of inbreeding.

6 0
3 years ago
During periods of extreme stress a client may experience elevated blood pressure, dilated pupils, and increased respirations. th
d1i1m1o1n [39]
The answer is <span>hy<span>pothalamus.</span></span>

<span>The hy<span>pothalamus <span>regulates the </span></span></span><span>sympathetic nervous system, part of </span><span> autonomic nervous system, </span><span>associated with fight-or-flight </span><span>responses.
During stress situations the sympathetic nervous system is more activated, causing a response of either run or fight. Because of that, the body needs to be prepared and there will be elevated blood pressure (the blood is going more to the skeletal muscle, heart,etc), dilated pupils (for better peripheral vision) and increased respiration. </span>
7 0
4 years ago
What is the source of carbon for the organisms of food chains?
murzikaleks [220]

Answer:

The Sun is the major source of energy for organisms and the ecosystems of which they are a part. Producers such as plants, algae, and cyanobacteria use the energy from sunlight to make organic matter from carbon dioxide and water. This establishes the beginning of energy flow through almost all food webs.

Explanation:

5 0
3 years ago
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