Answer:
I believe the answer is B
Explanation:
It can't be D tho
The answer is; C
Testosterone is regarded as the male hormone and responsible for male attributes such as high muscle and bone mass. It is produced by the Leydig cells of the testes This hormone is responsible for the formation of sperm in the male gonads. Therefore the hormone ensures male fertility.
A) inform the white blood cells of the invader so it can be destroyed. This works because antigens are proteins, and proteins have unique complex structures; the combination of antigens on the surface of a pathogen will each cause an immune response in the body, and ultimately white blood cells are part the immune system responses to destroy this pathogen.
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Blood travels through many different channels to optimize absorption. The water potential in the solution in the dialysis machine will need to be less than in the blood. If all the blood flows through a single large channel the blood water potential may be more negative than outside, therefore slowing absorption.
