Which essential nutrients does the body most need in order to build molecules within cells?
a. fats
b. proteins
c. minerals
d. carbohydrates

B. Proteins
Hence why body builds drink protein shakes in order to build muscle.

1.fossils 2.analogous organs 3.homologous organs

Plants take energy from the sunlight with the of chlorophyll so the plant starts the food chain. then an herbivore eats the plant and gets its energy.then a carnivore or a human eats the herbivore and gets its energy. : )