All organisms within a defined geographic area in relationship with each other in some way or another. this relationship is

am ecosystem is where a system is formed by organisms interacting with one another and their physical environment

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.