A life cycle is a serie of changes that happens to all living things.
They born, they grow and reproduce, and the cycle stars again...
Life cycle means the stages a living thing goes through during its life.
In some cases the process is slow and the changes are gradual.
Some living things as humans or mammals have in their life cycles stages such as birth, growth, adulthood, etc. Some other living things as birds go from the egg, to the chick, to the adult.
Insects go from the egg, to the larva, to the pupa, to the adult. Or amphibians for example go from the egg, to the larva, to the adult.
Every life cycle is the same for every generation.
Check the next information
Life cycle of a mammal
Life cycle of a bird
Enjoy this video about Life Cycles