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

Question

Responses

There was a major change in the diversity of life in the Phanerozoic eon.
There was a major change in the diversity of life in the Phanerozoic eon.

There was no change in the diversity of life in the Phanerozoic eon.
There was no change in the diversity of life in the Phanerozoic eon.

There was no life in the Precambian eon.
There was no life in the Precambian eon.

The rocks from the Phanerozoic eon are much harder than those from the Precambrian eon.

Answer 1

There was a major change in the diversity of life in the Phanerozoic eon.