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It is called the biota of the area.
population
A species that has died out is called an extinct species. There are many of them. Dinosaurs for instance.
hybrids
The collections of interbreeding organisms are called species. Species are capable of reproducing on their own and is often known as largest organisms.
a community
clone
The death of every member of a species is called extinction. When a large number of different species is dies out at the same time it is called mass extinction.
A group, but not a team
This sort of relationship is called a "symbiosis."
A species is called the "living dead" when it has dropped to few enough individuals such that there is not enough genetic diversity to build up the population again. For example if there was 1 organism of a species left on earth it would be called the living dead because there is no way for its species to reproduce and live on with a full, genetically diverse, healthy population. A species isn't called the living dead only if it reaches 1 individual, it could be 40, 25, etc. individuals. A species is called the "living dead" when it has dropped to few enough individuals such that there is not enough genetic diversity to build up the population again. For example if there was 1 organism of a species left on earth it would be called the living dead because there is no way for its species to reproduce and live on with a full, genetically diverse, healthy population. A species isn't called the living dead only if it reaches 1 individual, it could be 40, 25, etc. individuals.
Groups of similar organisms within a species are called populations. Populations consist of individuals of the same species that can interbreed and share a common geographical location.