In facilitated diffusion, what are the special channels that help substances cross the cell membrane made of? a
nucleic acids
proteins
water molecules
d
carbon bonds

mountains can affect the climate of nearby lands. in some areas, mountains block rain, so that one side of a mountain range may be rainy and the other side may be a desert. much of airborne moisture falls as rain on the windward side of mountains.

explanation:

answer; heredity;

answer; (a) medicalized;