I need help,, this should help move my grade up and i currently have an f:)

17. A. from an area of high concentration to an area of low concentration.

18. A. ATP/energy is required

19. Passive transport

20. D. The solution has the same solute concentration that the cytoplasm does.

21. C. Concentration gradients

Explanation:

In passive transport substances from a region of high concentration to a region of low concentration without the input of energy. Example : Diffusion, Osmosis. temperature and pressure can affect diffusion

Osmosis is a passive transport process in which what's emotional area of less concentration to an area of higher concentration.

Cells in a hypotonic solution swell as water enters and may burst if the concentration gradient is large enough.

not sure but try c two haploid cells

explanation:

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.