Fact 1: Sperm had to swim from male to female reproductive organs for fertilization.

Fact 2: If fertilization occurs, the fertilized eggs are now described as pre-embryos or zygotes.

Given the two facts above, answer the question "Sperm had to swim from what to what reproductive organs for zygotes to occur." with 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       