The uniting is known as fertilisation of the egg by the sperm.
Fertilization
The process of uniting an egg with a sperm is called fertilization. It occurs when a sperm cell penetrates the outer layer of an egg cell and fuses with the egg's nucleus, forming a zygote. This marks the beginning of a new organism's development.
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
Fertilization
A sperm and an egg.
the egg is larger than the sperm cell
egg by far
Twenty-three chromosomes are in a cell that is formed from a sperm and egg cell.
FERTILIZATION