Answer: d
The respiratory and circulatory systems bring oxygen and nutrients to the cells. The respiratory and circulatory systems work together to maintain homeostasis. The respiratory system moves gases into and out of the blood. The lungs contain the bronchi, bronchioles, and alveoli.
Explanation:
Stabilizing selection... I think it might be right if I'm wrong, sorry if I am.
A surrogate mother donates her uterus to assist another woman who cannot become or stay pregnant because that another woman has some problem in getting her eggs produced or in getting fertilized.
Surrogate is a process in which a woman's egg is getting fertilized artificially with the sperm of a man who belongs to a couple. After the egg gets fertilized then, that fertilized egg is transferred to the uterus of a woman who belongs to above mention couple.
So a third person will help a couple to have a baby, and that third person is called a surrogate mother who donates his uterus. This surrogate mother is called a biological mother.
Learn more about surrogate mother here
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