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The population.
It is the collection of individuals of a species arbatarily, interacting and communicating with each other in a particular ecosystem of the biosphere.
If a group of organisms cannot be interbreed, and create fertile offspring, thent hey are separate species. If the can be interbreed, and the offspring can also interbreed, then they are different sub-species, or phases of the same species.
Since we human beings are living organisms, we naturally have an interest in biology, the study of living organisms. Even aside from the relevance of biology to our own species, biology is relevant to many other species that form important parts of our lives, in terms of providing us with food, and many other things.
Biodiversity is the measure of the number of species living within an ecosystem.
A species that has died out is called an extinct species. There are many of them. Dinosaurs for instance.
population
Population
The population.
The definition of Extinct is no living individuals of a species or a non-viable reproductive population of a species of animals. If the species has no ability to reproduce it is extinct even though there are living examples.
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.
Extinction is when all of the individuals of a species die without any living offspring. This means that the species no longer exists.
5.8 %
a population
The amount of living things within an area
It is the collection of individuals of a species arbatarily, interacting and communicating with each other in a particular ecosystem of the biosphere.
a population