A single species of squirrel evolved over time into two species, each on opposite sides of the Grand Canyon. This change was most likely due to Select one:

Low variation in the initial population

Differences in reproductive rates

More food was found on one side

The isolation of the two groups

a unit of heredity that is transferred from a parent to offspring and is held to determine some characteristic of the offspring.

imagine a line passing through the center of earth that goes through both the north pole and the south pole. this imaginary line is called an axis. earth spins around its axis, just as a top spins around its spindle. this spinning movement is called earth's rotation. at the same time that the earth spins on its axis, it also orbits, or revolves around the sun. this movement is called revolution.