What offspring are expected from mating a roan bull and a roan cow?

In many humans, exposing the skin to sunlight over prolonged periods of time results in the production of more pigment by the skin cells (tanning). this change in skin color provides evidence that -

Is a measure of the different types of organisms in a community. question options: tertiary secondary primary none of the above

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