Is rock Layer D an intrusion or extrusion? Explain.

Intrusion stay inside of the rock layers and never make it to the surface, which makes it just magma, while extrusions are only on the surface and are lava.

Explanation:

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c) 50% there are four chromosomes. after crossing over, 2 of the four have been changed. that means any gamete has a 2 in 4 chance or 50% chance of receiving the mutated chromosome.