All living organisms take birth, grow and finally die. The time span between birth and death is called lifespan. It is used calculate the age of the particular organism. Different organisms have different lifespan.

The process of producing more of one's own kind is called reproduction. There are two ways of reproductions in animals, one is by laying eggs and by giving birth to the young ones. It helps in the continuity of life on Earth.

Insect goes through different stages in their life cycle. Moulting is one of the stages in the life cycle of insects like cockroaches. Shedding of old skin in a nymph is called moulting. These undergo moulting to change into their next life stage.