What do scientist use to determine the begining or end of a geologic time period? mass extinctions

diversification of life

index fossils

supercontinent formation and movement

index fossils

Explanation:

ive answered this question before

i think it is c

Explanation:

The fossil forms that occur in the rocks, however, provide the chief means of establishing a geologic time scale, with the timing of the emergence and disappearance of widespread species from the fossil record being used to delineate the beginnings and endings of ages, epochs, periods, and other intervals. i am not trying to copy the other guy or girl

the correct answer is b. possesses the characteristic of compartmentalization of organelles, wherein the organelles are bound by membranes.

explanation:

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