Answer:
The atmosphere is a protective layer of gasses that shelters all life on Earth, keeping temperatures within a relatively small range.
Explanation:
The possible genotypes of the children could be "XX, XY, XX^h, Y^hX"
They could have 50% regular girls with one being a carrier. 25% of a male who does not have it, and 25% chane of male who does have it.
Anything specific? This is pretty vague.
A brain would be my answer. Or do you mean a characteristic? Then I’d pick maintain homeostasis.
