4.1a Some organisms reproduce asexually. Other organisms reproduce sexually. Some

organisms can reproduce both sexually and asexually.

4.1b There are many methods of asexual reproduction, including division of a cell into

two cells, or separation of part of an animal or plant from the parent, resulting in the

growth of another individual.

4.1c Methods of sexual reproduction depend upon the species. All methods involve the

merging of sex cells to begin the development of a new individual. In many species,

including plants and humans, eggs and sperm are produced.

4.1d Fertilization and/or development in organisms may be internal or external.