The simple and direct inter relationships is called A succession
D, food chain
B, Niche
C, food web

but there is no

i guess you forgot putting it.

the answer is cell division : )

protein makes up the building blocks of organs, muscles, skin, hormones and pretty much everything that matters in your body.

some choices are:

peanut butter

seeds

eggs

yogurt

meats

fish

so pretty much meat, dairy, nuts, and grains.