You are presented with the question "What forms a zygote?" and the following answer choices: 
- 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

Now knowing that fertilization occurs when a sperm and an egg fuse and after fertilization, the egg becomes diploid and is called a zygote, choose the best answer.


 

  a sperm and an egg       