How do human beings contribute to the phosphorus and sulfur cycles?
a. deforestation

b. planting trees and shrubs

c. adding chemical fertilizers to the soil

d. introducing fish species to ponds and lakes

Why do carbohydrate molecules function so well as fuel for the body?

Next pretest: evolution select the correct answer in a laboratory population of flies, the female flies are gray and the males are yellowish gray. biologists observed that all the male flies had an equal chance for reproduction, but the male flies with the brightest colors were more likely to successfully reproduce. what phenomenon could explain such a change? a sexual selection b. disruptive selection c. stabilizing selection d. directional selection

Nucleic acid certain protein cell membranes certain carbohydrates