ANSWERS: 3
-
Only one. Once it has successfuly penetrated the wall of the egg, a near instantaneous change will prevent others from doing so. Recent research, though, indicates that a single sperm could not do it alone. It seems to take the activity of a large number of sperm to weaken the wall so that one finally gets through.
-
Except for genetic engineering - just one.
-
All of them...it just depends on who gets there first!
Copyright 2023, Wired Ivy, LLC