What is the advantage of these different feeding niches for the birds? A
less competition for food
B
fewer abiotic resources for each bird species
с
fewer biotic resources for each bird species
D
less energy available as the birds feed higher in the tree

it's D

Explanation: As more birds feed higher in the tree, available energy increases. More abiotic resources are available for each bird. Predators are less likely to feed on birds in a variety of locations.

answer; i believe that the correct answer is(d) nondisjunction during meiosis;

b. the carbon cycle ensures living things have a source of hydrogen