Fertilization occurs when a sperm and an egg fuse, and after fertilization, the egg becomes diploid and is called a zygote. Given these facts, what forms a zygote among 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       