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Karolina [17]
3 years ago
5

Why does a vestigial pelvis show that the ancestors of the modern whale once had legs?

Biology
1 answer:
OleMash [197]3 years ago
7 0
The research party began by exploring the embryonic development of whales' cousins, the dolphins. These creatures are intriguing because, for a brief time during development, they sprout hind limbs . That's why dolphins lose their 'legs'.” In whales, however, the story is more complex.
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How does the body responds to transplants and how doctors are able to successfully perform transplants
riadik2000 [5.3K]

Answer:

The body naturally responds by rejecting the new organ because it is identified as a foreign object. Doctors use tissue typing to measure the compatibility of the antigens in the organ to that of the recipient. Another way doctors make sure the organs are accepted is through immunosuppressants that make the immune system does not attack the organ.

Explanation:

must include:

body rejects transplants because it recognizes them as foreign

lymphocytes attack the new organ

tissue typing measures antigens on tissue donor organ for compatibility

immunosuppressants disrupt the replication process of lymphocytes that produce antibodies and makes the immune system less effective

6 0
3 years ago
Use this portion of a dichotomous key for tree identification to answer the question.
Charra [1.4K]

Answer:

They are nonlobed, simple leaves and are attached oppositely on the branch.

Explanation:

A dichotomous key is a tool you use in biology to know the identity of things in nature such as trees,flowers, fish or even rocks. This key has choices that follow each other in a progressive manner, where one choice led to the other until you identify the item.In this case, to identify Dogwood, you follow the below steps;

1b. Broad leaf = Step 2

2b. Simple leaf = Step 7

7a. Leaf bases attached opposite each other on branch = Step 8

8b. Leaves not lobed = Step 9

9b. Leaves not heart shaped = Dogwood

The key is (1b,2b,7a,8b,9b)

8 0
3 years ago
Which is not a compound? 8H2 H2O 6CaO 5HCl
den301095 [7]
The answer is 8H2. the actual equation doesn't make sense
7 0
3 years ago
What is the significance of the sequence of nucleotides in an bacteria’s DNA?
lisov135 [29]

Answer:

The two strands of DNA need to be separated so new bases can pair with each template strand. What is the significance of the sequence of nucleotides? It determines the type of protein being produced.

4 0
2 years ago
The plants growing high in the tree canopy send out roots. The roots are searching for water vapor in the humid air of the fores
astra-53 [7]
This response that helps aerial plants find water is called evapotranspiration. It <span> is the </span>sum<span> of </span>evaporation<span> and </span>plant transpiration<span> from the Earth's land and ocean surface to the </span>atmosphere<span>. Hope this answers the question. Have a nice day. </span>
8 0
3 years ago
Read 2 more answers
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