- A life cycle is defined as the complete succession of changes undergone by an organism during its life. A new cycle occurs when an identical set of changes is begun.
- All organisms go through stages of development.
- Environmental conditions such as water, temperature, and light affect the development of organisms.
- In most mammals the stages of life go from the fertilized egg, to the fetus, the juvenile, and then to the adult.
- Birds go from the egg, to the chick, to the adult.
- Amphibians go from the egg, to the larva, to the adult.
- Plants go from the seed, to the seedling , to the flowering plant.
- Insect go from the egg, to the larva, to the pupa, to the adult.
- Scientists can even describe the life cycle of a star or a plastic bottle.
- Even families can have a life cycle. Most families have the parents come together as a unit. They can then have a child. The child becomes an adult. The new adult leaves home, finds a partner, produces offspring and the life cycle begins again.
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