How far back in history would scientists need to use models to describe earth system 2500 years
200 years
5000years
1000 years

i can't see the full page, therefore, can't answer it

explanation:

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.