because the sperm cells fail to find the egg cells or the sperm isn't good to unite with the egg
Fertilization
When sperm coming from the testis of a male person happens to enter the tube where the egg is , one sperm may unite with the egg.
they jion the they come and the unite.
Zygote
It is called Fertilization.
Fertilization
When sperm coming from the testis of a male person happens to enter the tube where the egg is , one sperm may unite with the egg.
One because the sperm is one cell and the egg is one cell
millions of sperms cell unite with egg cell.......okie??millions of sperm cell
Generally, one sperm cell and one egg cell unite for each offpring that is created (some cases, such as monozygotic/idential twins, are different). This means that if a human has one baby, it was one sperm and one egg. Or if a dog has 5 puppies, it was 5 egg cells and 5 sperm cells that united.
Fertilization occurs when a sperm and egg unite.
Sperm is created in the testicles and transferred to a woman by the erect penis. "Male sex cells" are sperm cells, which unite with the woman's egg cells to cause pregnancy.
they jion the they come and the unite.
plato : answer D
somwhere in the midle.... ;)
Conception
Zygote