What is meant by the term "U"? In your answer, please explain how it impacts humans and what it has to do with the atmosphere.

frogs. the lower the ph the higher the acid content. frogs have the highest tolerance in this scenario.

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.

c is the correct answer!