Which is the BEST example of a community responding to an external factor? A. Plants and animals thrive on the forest floor after the fall of a white pine causes an opening in the canopy.
O
B. Many species of raptors fly alongside each other during the autumn migration to warmer climates.
O C. Elephants use their tusks to dig the salt needed in their diets from the wall of a cave.
O D. Adult musk oxen in a herd surround their young to protect them from wolves.

the fossil record provides evidence of a common ancestor to many species.

this age may represent the age of the earth's accretion, of core formation, or of the material from which the earth formed. this dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.

the answer is z.

the human body has five levels of organization. level 1: cells. cells are the basic units of life and form the first level of organization. cells in the human body have specific functions. examples include nerve cells, blood cells, liver cells, and so on.