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

Fact 2: Each archegonium is flask shaped.

Given the two facts above, answer the question "What shape is the organ where fertilization occurs when sperm swim to an egg?" with the following options: 
- a prism
 - Flask
 - liquid
 - rings
 - Seesaw
 - porous
 - organ
 - gills


 

  Flask       