Question

a scientist uses radioactive dating and determines a fossil is 100 million years old. what can be concluded about the rock layer in which it was found?

Explanation:

Fossils are found in the same - age rock layers they were buried in. If a fossil is 100 million years old, the rock layer it was found in is also approximately 100 million years old as they were formed around the same time.

Answer:

The rock layer in which the fossil was found is approximately 100 million years old.