Describe the process of fertilization.

(N/A) Fertilization is the process of fusion of two similar or dissimilar gametes,known as syngamy,which results in the formation of a diploid zygote.
There are two main types of fertilization:
$1$. External fertilization: In this type,syngamy occurs outside the body of the organism. Examples include most aquatic organisms like algae,fish,and amphibians.
The major disadvantage of external fertilization is that although they produce a large number of offspring,the offspring are highly vulnerable to predators.
$2$. Internal fertilization: Syngamy occurs inside the body of the organism. Examples include fungi,birds,and mammals.
In this process,male gametes are released close to the female gametes,where they fuse to form a zygote.