Not all genes are “turned on" at a given time turn or false

false

Explanation:

Only turns on a fraction of the genes

the answer is: metamorphic rocks often show the presence of fossils, also a

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-lavira: )

igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.