The most common Precambrian fossils are _______ , layered mounds of calcium carbonate.
A) trilobites
B) eukaryotes
C) prokaryotes
D) chert
E) stromatolites

Question

Quizplus · Accepted Answer

Stromatolites are the most common Precambrian fossils, which are layered mounds of calcium carbonate formed by the activity of microbial communities known as cyanobacteria. Trilobites and eukaryotes, on the other hand, did not appear until much later in the Paleozoic era. Prokaryotes are a broad group that includes many types of bacteria and archaea, which were common in the Precambrian but do not leave behind fossils as easily identifiable as stromatolites. Chert is a type of sedimentary rock that can contain fossils but is not itself a type of fossil.

The Most Common Precambrian Fossils Are _______ , Layered Mounds