Horses evolved teeth with a cement covering and evolved from multiple toes to a single hoof because:
a. their diet changed from plants and meat, to just plants.
b. horses have always been the same.
c. their environment changed from forest to grassland as the forests shrank.
d. they became hunted by humans and evolved advantages to run faster.

Spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

When in solution, a molecule that moves slowly across an artificial membrane moves rapidly across a plasma membrane. this molecule rapidly enters the cell regardless of whether its concentration is higher inside or outside the cell. using this information, which transport mechanism is most likely to be responsible for the movement of the molecule across a plasma membrane? view available hint(s)when in solution, a molecule that moves slowly across an artificial membrane moves rapidly across a plasma membrane. this molecule rapidly enters the cell regardless of whether its concentration is higher inside or outside the cell. using this information, which transport mechanism is most likely to be responsible for the movement of the molecule across a plasma membrane? active transportexocytosis

Diffusion and osmosis are forms of passive transport