Question

What naturally cycled element is so abundant atmospherically and vital for nucleic acid and protein synthesis, yet

not directly available for use by animals and plants?
A. Carbon
B. Oxygen
Nitrogen
Phosphorus.
D.
C.​

Answer 1

Nitrogen

Step-by-step explanation:

Nitrogen is the most abundant element in our atmosphere and 7th most abundant in the universe. It is vital in the formation of nitrogenous bases which are the key bonds that form nucleic acids such RNA and DNA.