idk really lemmme do a quick guess
Underwater weighing
B. its should be propped up against the wall
The best way to describe a human sperm cell is a tad pole (Baby frog). Like the sperm cell the tad pole has a head, body and a tail. Though tad poles are finished products, the sperm cell needs to combine with the egg cell for it to be fertilized.
I would say this is A. Head , hope this helps !
D) increased breathing rate for a shorter period of time
