3-Circle Model-
What does each part represent?
b. How does each part work together?

the answer to your question is:

c. complementary base-pairing

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.