The uniting is known as fertilisation of the egg by the sperm.
Fertilization
The process of uniting an egg with sperm is called fertilization.
The uniting of an egg and sperm cell is called unification
The uniting of the egg and sperm (conception) typically takes place in the
fertilisation I think ... But so a bit more research yourself on it
sexual reproductive
With a condom
Fertilization
The process when an egg cell and a sperm cell COMBINE is called Fertilization
A sperm and an egg.
the egg is larger than the sperm cell
It fuses with the membrane of the egg cell, and the content of the sperm cell enters the egg cell.