The study of plants and animals in relation to their environment. A virtually self contained system, consisting of a community of plants and animals in a given habitat together with their environment. Occurring naturally in, and restricted to one particular geographic region. The long term process of change in organisms. The dying out of a species of living thing, and its complete disappearance from the earth.
Energy passes from one level to the next.
All the food chains in an ecosystem are connected together in a complex food web. The land mass that included Australia, New Zealand and South America before it spit up some 65 million years ago. A specific area, small or large, that is inhabited by a particular community of plants and animals. There are 100 hectares in a square kilometre. The great majority of Australian forests are eucalypts.