Animals get the most of the nitrogen they need a

a by consuming plants or other animals.

b by breathing in atmospheric nitrogen.

c directly from bacteria in the soil.

d from the process of denitrification.

The answer to complete this sentence would be A) or the first option because animals get their energy by eating other animals and eating plants so they can charge themselves up like a battery, not all animals eat each other so eating plants or each other can give them nitrogen as well.