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Science Homework BY JMH

Across
These first organism
Species with low numbers
The beginning of a new community, where a community had already existed.
Is the final stage of succession
Takes place in a community where few,if any,living things exist
Down
The process of one ecosystem changing into a new and differant
Along with miroorganisms.
When a species is in danger of being extinct
When a last member species die
First living in other wise lifeless area