Which kingdom contains heterotrophs with cell walls of chitin?

How does natural selection change thephenotypes within a population over time?

Which of the following is a difference between active transport and facilitated diffusion? view available hint(s)which of the following is a difference between active transport and facilitated diffusion? facilitated diffusion can move solutes against a concentration gradient, and active transport cannot. active transport involves transport proteins, and facilitated diffusion does not. facilitated diffusion involves transport proteins, and active transport does not. active transport requires the expenditure of cellular energy, and facilitated diffusion does not.

The united states uses which source of energy to produce almost 40 percent of its electricity