Fact 1: Fertilization occurs when a sperm and an egg fuse.

Fact 2: After fertilization, the egg becomes diploid and is called a zygote.

Given the two facts above, answer the question "What forms a zygote?" with the following options: 
- Most plants
 - a sperm and an egg
 - remains of prehistoric life
 - bacteria
 - and egg and an egg
 - Leptospirosis
 - a sperm and a sperm
 - Plant reproduction


 

  a sperm and an egg       