Why large pieces of earths crust move around and bump into each other?

The large pieces of Earth's crust lay on hot molten rock. These pieces are like a cracked shell and the heat of the hot molten rock causes them to move .

Explanation:

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The large pieces of Earth's crust lay on hot molten rock. These pieces are like a cracked shell and the heat of the hot molten rock causes them to move .

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.