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Ecosystems can be changed by natural events or by human actions. Which is NOT a natural event? A. A forest fire started by lightning B. pollution from a factory entering a river C. a beaver building a
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Ecosystems can be changed by natural events or by human actions. Which is NOT a natural event?

A. A forest fire started by lightning
B. pollution from a factory entering a river
C. a beaver building a dam in a river
D. An earthquake

User TobiO
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C. Pollution is man made if it weren’t for our factories there wouldn’t be this much pollution
User Bushikot
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Hi! The answer would be B. pollution from a factory entering a river because humans built the factory so that it would drain into the river, therefore it is unnatural.
User Daramarak
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