It is energetically more efficient than sexual reproduction

It results in offspring that are nearly identical to the parent

It can result in haploid or diploid offspring

It does not occur in animals

Adapt via natural selection to eat a new type of food

Reproduce asexually by budding

Have a high level of reproduction so some offspring have a chance of living

Engage in sexual reproduction

Nutrients for the developing embryo are delivered by the mother’s blood supply.

There is limited or no embryonic development  within the mother.

Fertilisation occurs externally.

The egg  containing the embryo is retained inside the mother until they hatch.

Internal  fertilization and oviparity

External fertilization and oviparity

External fertilization and the amniotic egg.

Internal fertilization and the amniotic egg.

Organisms possessing an organ forming from the fusing of the chorion and allantois that allows the embryo to obtain nutrients directly from the mother.

Organisms displaying extensive parental care.

Organisms possessing an allantois that encloses a space for the collection of metabolic waste from the developing embryo.

Organisms possessing a membrane bound  fluid filled cavity, which provides the embryo an aquatic environment within the mother, in which to develop.