How did the number of organisms change between 1900 and 2010

the number of prey and predators has decreased

Explanation:

this is because of increased rate of hunting .the prey such as elephants and rhinos are being hunted for their horns while predators are also being hunted because of their skin.

also due to man and wild animal conflicts which happen in areas nearing the forests ,both prey and predators are killed.

it enhances antibody production by t cells of the adaptive immune system.

hope i'm right

explanation:

answer; i believe the answer is (polygenic inheritance;