About how long after the earth's core formed was the end of the intense bombardment?

Adigestive system that is a series of tubes beginning at the mouth and ending at the anus is a digestive system.

Penelope studies how the structure and function of the nervous system is related to behavior. she is a psychologist

According to the cell theory, which describes cells? a. all organisms are composed of multiple cells. b. all cells have the same structure and function. c. cells are found in everything on earth. d. living organisms are not created spontaneously