A species is a group of organisms with similar features that distinguish them from all other organisms.

The variety of living things, their relationships and the ecosystems they form.

It helps us to: clarify relationships among organisms, remember organisms and their typical features and communicate the identity of the organisms being study.

Continuous variation is where a feature changes gradually over a range of values. Examples are height and wing span. However, discontinuous has a limited number of values, like gender, blood group and vein patterning.

An environment can change your health, diet and growth. Climate can influence living things. Inherited and genetic variations cannot be changed.

The offspring inherit one set of information from the mother's egg cell nucleus and one set from the father's sperm cell nucleus. Every egg and sperm cell contain different hereditary information.

Natural eye colour, hair colour, blood group and diseases.

Selective breeding is the mating of two individuals because of their characteristics, to produce an offspring with a combination of desired characteristics.

A process by which characteristics that can be passed on in genes become more common if a population over many generations if they help the organism survive.

Lamarck

Darwin

Wallace

Wide