Question

1. which of the following does not explain why there are very few fossils from the precambrian era?

rocks were mainly metamorphic and igneous, which do not contain fossils.
there were no living organisms during this era to form fossils.
most living organisms did not have hard components, so they could not form fossils
rocks were old and had been eroded, so there were no fossils left.

Explanation:

The Precambrian era did have simple living organisms (like cyanobacteria), so this statement is false and does not explain the scarcity of Precambrian fossils. The other options are valid explanations: Precambrian rocks were mostly metamorphic/igneous (which rarely preserve fossils), most organisms lacked hard parts that fossilize easily, and ancient rocks were heavily eroded destroying any existing fossils.

Answer:

C. There were no living organisms during this era to form fossils.