Which best explains why the sun maintains its size and shape? A. Pressure caused by high temperatures are balanced by gravity.
B. The sun burns from its core to its surface.
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C. Forces exerted by orbiting planets cause the sun to rotate.

A

Explanation:

The Suns own weight keeps itself together and keeps its size and shape. all things have gravity. in this case, the sun keeps it shape with balancing its gravity with the pressure.

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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.