Question

Animals need various nutrients in order to live and grow. Nitrogen, for example, is a nutrient that is needed to form molecules, such as DNA and RNA. How do animals obtain nitrogen?
A.
They create nitrogen in their bodies using other nutrients as building blocks.

B.
They eat plants which have absorbed nitrogen from the soil.

C.
They breathe in and absorb nitrogen gas from the atmosphere.

D.
all of these

Answer 1

Answer:

B

Explanation:

Nitrogen is essential for all living things because it is a major part of amino acids, which are the building blocks of proteins and of nucleic acids such as DNA, which transfers genetic information to subsequent generations of organisms. About 78 percent of the atmosphere is made of nitrogen, but plants and animals can't take nitrogen directly from the air. A process called the nitrogen cycle makes this happen.