In facilitated diffusion molecules only move with the aid of a protein in the membrane. Normal diffusion requires molecules to move through a special doorway
Hi!
The answer is <span>D. Epinephrine widens the air passageways in the lungs.
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Answer:
D. the nucleus contains the protons and neutrons which takes up most of the mass of the atom
Explanation:
I don't belev there will b another planet.....they took Pluto off cause it was too small to b co side red as a planet as there r lots of other stars or whatevr that size...I cud b wrong in this idk