Sexual reproduction increases the genetic diversity in the organisms. This allows a population to have survival and reproduction advantages during natural selection.

On the other hand, asexual reproduction involves the production of offspring that are genetically identical to the parent. This method allows a population to produce rapidly in large numbers.

The animal’s eggs can be fertilized in the following ways:

1. Internal fertilization: This takes place inside the body of the female or the egg-producing individual.

2. External fertilization: This takes place outside the body of the female or the egg-producing individual.

Embryos can be developed in the following ways:

1. Oviparous species: Embryos develop outside of the parent’s body.

2. Ovoviviparous species: Embryos develop inside the parent’s body. However, the embryos acquire nutrients from the yolk sac of the eggs and not from the mother.

3. Viviparous species: Embryos develop inside the parent’s body and acquire nutrients from the mother’s placenta.

The evolution of amniotic egg has become an advantage to animals that live on land. The type of egg allows the embryo to develop outside of the parent’s body without requiring water. The egg has a fluid-filled sac that cushions the embryo and to prevent it from drying out.

Here is how a complete metamorphosis and an incomplete metamorphosis are alike and different from each other.

Similarity: Metamorphosis occurs in terrestrial invertebrates. They undergo immature and adult stages in both complete and incomplete metamorphosis.

Difference: In incomplete metamorphosis, the nymphs resemble the adults. On the other hand, a complete metamorphosis involves a developing larva that looks completely different from the adult.

Typically, an organism has a full set of chromosomes in its body cells. When it comes to sexual reproduction, reproductive cells undergo meiosis and split the number of chromosomes into a half. A male individual produces sperm and a female individual produces eggs. Each sperm and egg cell contains half the number of chromosomes.

This specialization allows the mixing of different gene combinations and increases the genetic diversity in a population. When the genetic diversity is high, the population gains survival and reproduction advantages during natural selection.