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27 February, 23:31

Which situation is a result of human activities?

a. decay of leaves in a forest adds to soil fertility

b. factory smoke causing acid rain in an area which kills fish in a lake

c. ecological succession following volcanic activity reestablishes an ecosystem

d. natural selection on island changes gene frequencies

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Answers (2)
  1. 28 February, 00:43
    0
    The correct answer would be B since humans made the factory.
  2. 28 February, 01:18
    0
    The correct answer is b
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