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Science
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| Number of pages / Number of words: |
6 / 1471 |
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Fish cannot be used because they can leave a polluted area and return when it is has become less threatening. Macroinvertebrates are divided into 4 groups, which are directly connected to how tolerant to pollution they are. The first group is sensitive to pollution, group 2 is semi-sensitive to pollution, group 3 is semi-tolerant to pollution and group 4 in tolerant to pollution...
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Basically, if a river is very polluted you would only find group 4 macroinvertebrates, whereas if the stream was healthy, you would expect all the groups to be present. Group 1 macroinvertebrates consisted of: dobsonflies, alderflies, water snipeflies, and stoneflies. Group two includes: caddisflies, damselflies, craneflies, water penny larvae, freshwater mussels, riffle beetles, dragonflies, mayflies and crayfish...
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