As a byproduct of their photosynthesis, _______ produce most of the oxygen in the atmosphere.
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Q48: Those organisms whose distinctive features are primarily
Q49: The total number of _ presently identified,
Q50: Those events during which many species become
Q51: An ecosystem is made up of _
Q52: _ is the term used to describe
Q54: Nonnative species are also called _ species.
Q55: Because they are visually interesting and relatively
Q56: _ activity appears to have the potential
Q57: Many biologists believe that a mass extinction
Q58: Numerous reasons have been proposed for maintaining
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