Sperm had to swim from male to female reproductive organs for fertilization, and if fertilization occurs, the fertilized eggs are now described as pre-embryos or zygotes. Given these facts, sperm had to swim from what to what reproductive organs for zygotes to occur. among the following options:
- barnacles
 - male to female
 - animals
 - ocean water
 - male to male
 - mouth of rivers
 - female to male
 - female to female


 

  male to female       