Can animals use the carbon that is in the air directly or indirectly?

Directly. Animals get carbon by consuming plants and eating other animals that obtain carbon from food. Carbon moves from one living thing to another and circulates in the environment through the carbon cycle

Directly animals get carbon by eating plants and eating other animals

The correct answer is c. orbital shape. "the angular momentum quantum number l describes the shape of an orbital. it corresponds to each orbital type, i.e. (0,1,2,−1)=(s,p,d,f,g,"