Animal reproduction

1. Asexual reproduction in animals The type of reproduction seen in an organism is related to its complexity. The animals that have evolved the most, like vertebrates, reproduce sexually. [...]

Reproduction is the only vital function that is not needed to keep an individual alive. It ensures the continuation of the species. [...]

1.1. Types of reproduction The type of reproduction seen in an organism is related to its complexity. The animals that have evolved the most, like vertebrates, reproduce sexually. In contrast, asexual reproduction is common in invertebrates. [...]

In ancient times, many people believed that living things could be created spontaneously from decomposing material. Aristotle stated that flies and mosquitoes were produced spontaneously from mud in puddles and from rubbish. [...]

2.1. How do animals reproduce sexually? In sexual reproduction in animals, a new organism is created by the union or fertilisation of two gametes from individuals of different sexes. [...]

The term life cycle refers to all the phases that take place throughout the life of a species. If development is direct, the juvenile forms look like the adults. If it is indirect, they undergo metamorphosis. [...]

3.1. Reproduction in mammals Mammals reproduce by internal fertilisation. They are viviparous. Males have a penis that they use to introduce sperm into the female's body. Fertilisation then takes place. The embryos develop in the uterus. [...]

Reproduction is the only vital function that is not needed to keep an individual alive. It ensures the continuation of the species. [...]

Reproduction is the only vital function that is not needed to keep an individual alive. It ensures the continuation of the species. [...]

Reproduction is the only vital function that is not needed to keep an individual alive. It ensures the continuation of the species. [...]

Reproduction is the only vital function that is not needed to keep an individual alive. It ensures the continuation of the species. [...]