Types of fertilization

Fertilization is an essential process in sexual reproduction. It fuses the gametes thus restoring  the chromosomes number specific for the species.there are two types of fertilization,external and internal.

A quick warm up

1- Define fertilization.
The fusion or the union of sperm nucleus and an egg nucleus.

2- What is the importance of fertilization in sexual reproduction.?
It restores the chromosome # characteristic of the species.