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Ecologist have observed a sharp increase of sulfur dioxide in the air . what might be a possible consequence of excessive sulfur dioxide in the air ? a. acid rain b. ozone layer depletion c.ozone layer hole d.increase in sea levels
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Describe how a student should adjust the microscope to see the cells on a slide more clearly?
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Which description provides the best objective summary of the article in the passage?
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Describe the process of sexual reproduction in sponges....
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