Which of earth’s spheres includes the oceans, groundwater, lakes, and glaciers?

In what part of the body does the most muscle activity happen?

What is genetic variation? -(a) each individual in a population has slightly different genes. -(b) some individuals in a population have more genes than others. -(c) each population of a species has slightly different genes. -(d)some populations of a species have more genes than others.

Besides regulating what enters and leaves the cell, what is another function of your choice from question #1?