In biology, an organism is any life thing . In at least some form, all organisms are capable of response to stimulus , reproduction, growth and developmental biology, and maintenance of homeostasis as a stable whole.... that has not yet reached its adult
Adult
The term adult has at least three distinct meanings. It can indicate a biologically grown or mature person. It may also mean a plant, animal, or person who has reached full growth or alternatively is capable of reproduction, or a person who has attained the legally fixed age of majority; as opposed to a minor.... form, sexual maturity
Sexual maturity
Sexual maturity is the age or stage when an organism can sexual reproduction. It is sometimes considered synonymous with adulthood, though the two are distinct.... or size. Juveniles sometimes look very different from the adult form, particularly in terms of their colour.
In many organisms the juvenile has a different name from the adult, see List of animal names
List of animal names
This lists names of animals used depending on the context. Many species of animals, particularly those domesticated, have been given specific names for the male, the female, and the young of the species.... .