Fact 1: Fertilization occurs when sperm swim to an egg inside an archegonium.

Fact 2: Pregnancy begins with a fertilized egg.

Given the two facts above, answer the question "Sperm swim to an egg inside a what?" with the following options: 
- gastropod shells
 - aqueous solution
 - archetype
 - archive
 - ocean water
 - pollen
 - archegonium
 - sperm


 

       archegonium  