The basic unit of matter. The simplest form of an element.

If the kidney cell of a bird has 64 chromosomes how many chromosones does the sperm of this bird have

If bacteria are much too small to see, what is one reason why can we see colonies in the petri dishes that have plenty of food to eat after only a few days?

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 -