Fact 1: Fertilization occurs when a sperm and an egg fuse to form a diploid zygote.

Fact 2: Sexual reproduction requires formation of gametes, followed by fertilization.

Given the two facts above, answer the question "What involves a sperm and egg fusing to form a diploid zygote?" with the following options: 
- Leptospirosis
 - produce offspring
 - allow growth
 - sexual reproduction
 - metabolic reaction
 - peachleaf willow
 - rapid expansion
 - Plant reproduction


 

    sexual reproduction     