For example, platypus are endemic to south-east Australia. Occurring no more. The word is usually used for species but can apply to any level of classification. Recent extinctions are hard to prove, and an official limit of 50 years with no recorded sightings of the species is now used. The variety of different types of genes in a species or population.
Genetic diversity is really a form of biodiversity.
The place or places normally occupied by a particular species or population. Usually defined as animals without backbones, invertebrates make up the vast majority of all animal species. Only fish, amphibians, reptiles, birds and mammals are not invertebrates. Insects, spiders, worms, slaters and many marine creatures such as corals, sponges and jellyfish are examples of invertebrates. Literally meaning big foot , the word is used to describe kangaroos, wallabies and rat kangaroos.