The author compares the wings, tails, and crests of different pterosaurs. Why does the author make these comparisons?

a chair, a bed, and a toothbrush

explanation:

the correct answer is b

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.