Sexual reproduction that involves two parents.
Sexual reproduction ensures that the offspring has genetic veriation
, which makes the offspring different than the parent... mabey even better, because they could have more strength against a certain disease.
In sexual reproduction the fertilization can be internal or external. In some species, the male and female mate, and fertilization occurs inside the females body. In other species the female lays eggs that the male then fertilizes outside the females body.
Some animals lay Fertilized eggs, while others, like ourselves give birth to live offspring