Fertilization occurs when a sperm and an egg fuse to form a diploid zygote, and sexual reproduction requires formation of gametes, followed by fertilization. Given these facts, what involves a sperm and egg fusing to form a diploid zygote among the following options:
- Leptospirosis
 - produce offspring
 - allow growth
 - sexual reproduction
 - metabolic reaction
 - peachleaf willow
 - rapid expansion
 - Plant reproduction


 

    sexual reproduction     