Life forms in the Precambrian include
A)trilobites,brachiopods and stromatolites.
B)cyanobacteria and trilobites.
C)the agnatha and the coelacanths.
D)stromatolites and certain primitive blue-green algae.

Question

Quizplus · Accepted Answer

The Precambrian period dates back over 4 billion years ago, and during that time, there were no complex animal life forms like trilobites, brachiopods, or coelacanths. Instead, life forms in the Precambrian were mostly simple and included stromatolites and certain primitive blue-green algae. Therefore, the best choice is D.

Life Forms in the Precambrian Include