• 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 just depends on who gets there first!

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