Probably to not contaminate food or accidentally poison it.
The best answer is d. endometrium.
Endometrium is the innermost layer in the Uterus, and it is found in the whole uterus.
For comparison, Cervix is the structure on the "bottom" of the uterus, vagina is below it (outside of the womb) and the ovaries if where the unfertilized eggs are.
The answer is A. Sex-linked traits are more often expressed in males because they are typically carried by the X chromosome and they are also typically recessive. Males only inherit one X chromosome, so if the one they inherit is linked to the disease, they will express it no matter what. Females, on the other hand, can be carriers if they inherit one X chromosome with the disease. This is because their other X chromosome can be normal, which would dominate the expression of the disease on their other X chromosome.
The answer to the problem is A
