I will go with A ....as radiation is out of question..... DNA sequence is same in all.......I don't think evolution is a mistake !
so A
•Sex cells are also called gametes
•embryos develop on the lining of the uterus
•the ovaries produce the eggs
•the process of developing and releasing eggs is called the menstrual cycle
•once a sperm cell enters an egg cell no other sperm cell can enter
•the gender of the child depends on the sperm cell
It is the theory of of evolution which would be D
