Answer: The answer is D). Hypoxia increases the secretion of erythropoietin by the kidneys
Explanation: Hypoxia is a condition in which the body or a region of the body is deprived of adequate oxygen supply at the tissue level. When the kidney has a low supply of oxygen, it produces a protein called erythropoietin (EPO), which stimulates red blood cell production.
Answer is B hope it helps
The best answer for this question would be:
A.
They gave them a way to set fair wages.
The guilds had helped workers set a more economic system for
their work. This provided a safe way to segregate the finance without any
trouble.
Answer: Because both of them investigate something.