Scientists decide the age of different rock layers by the things that they uncover in the rock. Which of the items below could scientists use to date a layer of rock?
A.
an insect flying near the dig site
B.
a fossilized fish
C.
a raindrop on the rock
D.
a green leaf that fell off of a tree

B. a fossilized fish

Explanation:

The fossilized fish shows the scientists how old the rock is. They can date it back.

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