Question

question 3 of 10
what factor prevents us from finding fossils from the precambrian era?

a. there are no rocks left from that era.

b. life was destroyed by a series of mass extinctions.

c. life - forms in this era had no skeletons.

d. this was before life existed on earth.

Explanation:

• Option A: There are rocks from the Precambrian era, so this is incorrect.
• Option B: Mass extinctions are not the main reason for lack of Precambrian fossils; early life forms' structure is.
• Option C: Precambrian life (like bacteria, algae) lacked hard skeletons/shells, making fossilization rare. This matches the reason for few fossils.
• Option D: Life (simple) existed in Precambrian, so this is wrong.

Answer:

C. Life-forms in this era had no skeletons.