What is gradual change in an environment over time?

The development of a community on bare, exposed rock is...

The recovery of the area around Mt. St.Helens is an example of

Pioneer species on bare rock are commonly

a stable community within an ecosystem

the process of burning fuel, such as oil and coal, is

During nitrogen fixation, nitrogen gas is converted to a form that _____ can use

The breakdown of dead materials into carbon dioxide and water is called

water changes to a liquid to a vapor during

all biological molecules contain

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