Flagellum
Fertilization
It is called a Zygote..
the single cell when a sperm's DNA combines with the egg's DNA is called fertilization
A diploid cell called a zygote is formed with a sperm and egg fuse.
sepals
germ cells
Sperm
Ejaculation.
They call it "similarity" you should know that.
The seminal fluid you call "pre sperm" has no living matter, sperm cells will survive for a short while on skin.
chromatin fibres
Pre-ejaculate.
The union is called fertilization and only one sperm can fertilize an egg.
I assume you are referring to structures that are left over and serve no apparent purpose. These are called vestigial structures.
sperm
Fertilization
That's called 'fertilisation'.