It should have the shape number 2.

The substance A has a region that will bind to the nerve cell Y.
The drug developed that's going to block the substance A, will have to have a region that is complementary to the substance A. If those two regions get linked the substance A will have nowhere else to bind.

3 0

3 years ago

Which population would be least likely to survive a change in its ecosystem?

Burka [1]

Answer: D

Explanation:

lIf the change in the ecosystem occurs, then it would effect the weather, temperature, and the abiotic factors. So, we can see that the bacteria could survive in any sort of temperature. So, A can't be it. Also, B can't be it because the grass can grow in any sort of soil, even if the soil is contaminated. C cant be it because even if the change in the envoriment (temperature, contaimination) kills of one of the brown bear's food source, they can still have other things they can eat. But, if the weather gets too hot or the soil gets contaimnated and kills off the ecalyptus plants, the koala has nothing else to eat. So, best answer is D.

8 0

3 years ago

Correct answers only please!

cestrela7 [59]

It’s B I’m 99% sure lol

7 0

3 years ago