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At one time, all living things were classified into two kingdoms of plants and animals. Aristotle developed this first classification system.
Archaebacteria, Eubacteria, Protista, Fungi, Plantae, and Animalia.
Things classified by comparing their likenesses and differences. Things are put into classifications according to things that are alike among them.
* Living things are made of cells. * Living things obtain and use energy. * Living things grow and develop and move. * Living things reproduce. * Living things respond and may adapt to their environment.
It is a system of classification.However, it is important to recognise that there are many ways in which a set of things can be classified. For example, people living in a town can be classified according to their gender, or age, occupation, educational attainment, height, mass, place of birth, zodiacal sign or any combination of these (and other) characteristics.