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    In terms of biodiversity, which is more fragile? A tropical forest ecosystem or an...

    A tropical forest is more fragile because it contains more variables. There ar emore species, etc. Therefore there is a higher chance that one of those things will be defected.
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    Outcrops and history?

    If an outcrop shows alternating layers of sandstone and limestone, what can you assume about the geological history of that region?
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