You are presented with the question "Where is a zygote formed by sperm swimming to an egg?" and the following answer choices: 
- colder and wetter
 - ocean water
 - graptolites
 - rapid expansion
 - a delta
 - an archegonium
 - barnacles
 - an organism's body

Now knowing that fertilization occurs when sperm swim to an egg inside an archegonium and when a sperm cell fertilizes an egg cell, a fertilized egg or zygote is formed, choose the best answer.


 

      an archegonium   