Fossils in Precambrian rocks are rare, while there are many fossils in rocks from the Phanerozoic eon. What does this evidence suggest?

A. There was a major change in the diversity of life in the Phanerozoic eon, probably due to mass extinction.
B. There was no life in the Precambrian eon.
C. The rocks from the Phanerozoic eon are much harder than those from the Precambrian eon.
D. There was no change in the diversity of life in the Phanerozoic eon.

The rareness of fossils in Precambrian rocks compared to the Phanerozoic eon's abundance of fossils suggests a significant increase in the diversity of life, especially following the Cambrian explosion. This period of evolution brought about an expansion of biodiversity with the emergence of new animal phyla. ;

Answered by JamesRipley | 2024-06-18

The rarity of Precambrian fossils indicates there was little biodiversity during that time, while the abundance of fossils from the Phanerozoic eon suggests a major increase in life's diversity, particularly after the Cambrian explosion. This period marked the emergence of many new multicellular organisms and ecosystems. Thus, the correct answer is A: There was a major change in the diversity of life in the Phanerozoic eon, probably due to mass extinction.
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Answered by JamesRipley | 2024-09-30