____ A group of ____ that have certain characteristics in common and are able to interbreed. ____ refers to the variety of ____ in an area. ____ is the total number of organisms of the same species inhabiting a place at the same time. ____ is the number of individuals in an area ____ species is a species in which the number of individuals falls so low that ____ is possible. Biodiversity is essential to the processes that ____ on Earth, including humans. Without a variety of animals, plants, and microorganisms, we cannot have healthy ____ that provide us with the air and food we breathe.

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