Question

Why can't plants and animals use the nitrogen directly from the atmosphere?

A:There is not enough of it in the air.

B:Nitrogen gas contains the element in an inert, unusable state.

C:They do use it directly from the atmosphere.

D:Plants and animals do not need nitrogen for their life processes.

Answer 1

they do use it directly from the atmosphere

Answer 2

plants do not use nitrogen directly from the air. This is because nitrogenitself is unreactive, and cannot be used by green plants to make protein.