Question

question 2 of 10
why do we not have many fossil records from the precambrian era?
a. all life was destroyed by comet impacts.
b. all rocks from the precambrian era have been destroyed.
c. there was no life on earth.
d. most life - forms were single - celled, with no hard parts to fossilize.

Explanation:

To determine the correct answer, we analyze each option:

• Option A: Comet impacts didn't destroy all life in the Precambrian, so this is incorrect.
• Option B: Not all Precambrian rocks are destroyed; some still exist, so this is wrong.
• Option C: There was life (like single - celled organisms) in the Precambrian, so this is false.
• Option D: During the Precambrian, most life was single - celled (e.g., bacteria, archaea, simple eukaryotes) and lacked hard parts (like shells, bones) which are more likely to fossilize. So this explains the lack of many Precambrian fossils.

Answer:

D. Most life - forms were single - celled, with no hard parts to fossilize.