Depth, flow, temperature, and chemistry of overlying water
One is simple and the other one is compound, simple ;D
When climbing a mountain, we can observe transitions in biological communities that are analogous to the changes in biomes at different latitudes.
Traits that are passed down on an X or a Y chromosome are sex-linked traits. Most of the time males are affected by sex-linked traits because males only have one X and a Y. The Y is the chromosome that makes a man, a man.
