5. Knowing the type of food consumed by an organism helps to
identify the role of the organism in the community. This role is
known as its
(1) nesting site
(3) biomass
territorial range
(4) niche

This role would be the organisms niche. None of the other choices make any sense. A nesting site is not a role, a biomass is not a role, and territorial range is not the role an animal has in its community. A niche is an organisms role in its community, how it interacts with the things around it, where it lives and what it does.

Ithink the answer is maybe a

The basic building blocks of dna and rna are nucleotides