It is due to variation .
No in fact most animals are the result of sexual reproduction
Sexual reproduction is the most advantageous for the production of a wide variety of different organisms. The other type or reproduction is asexual which is where one can reproduce on their own.
With asexual reproduction, the DNA creates a total copy, unique in no way whatsoever. However, with sexual reproduction, though the process is not as quick in most cases, there is a certain level of unique traits which allow the offspring to either spread into different areas, as most plants do, or become a better or worse version of the combination of its two parent genes. Also, in most animals and humans, sexual reproduction is rather pleasurable.
Sexual reproduction involves the fusion of two sex cells (sperm and egg) from two different parents, resulting in genetic variation in offspring. Asexual reproduction involves a single parent producing offspring that are genetically identical to the parent. Examples of sexual reproduction include humans, animals, and most plants. Examples of asexual reproduction include bacteria, some plants, and certain animals like starfish.
the primary function of animal reproduction is to replicate itself so the answer is a replication of themselves.
Most lower animals from Protozoa to Annelida show asexual reproduction .
Mesoderm is a type of tissue that arises in most animals during development. It gives rise to structures such as muscles, bones, and connective tissues.
A male fertilizes a female and she produces offspring. This happens in most animals and some plants.
An egg carried internally
An egg carried internally
Animals that reproduce their own kind with no sex cells involved undergo asexual reproduction. Most animals on Earth reproduce through the process of fertilization which include sexual reproduction. =Edited by TerroooBlade22
Oviparous -- reproduction by eggs that develop outside the body -- birds, most reptiles Viviparous -- reproduction via live birth where offspring develop inside the mother's body -- human, most mammals