I believe the answer is seminiferous tubules
A fertilized egg, or zygote, takes about five days to reach the uterus from the uterine tube. As it moves, the zygote divides and develops into a blastocyst, with an inner mass of cells and a protective outer ring. The blastocyst attaches to the wall of the uterus and gradually implants itself into the uterine lining.
You would use a open stance.
I would say f!!!!! hope this helps
Fairly obvious, but the answer is A. Overloading your muscles too often