Wednesday, January 13, 2010

What are two relationships that are beneficial to other species but harm humans?

Can someone please help me find an environmental relationship that is either natural or domestic that shows that it benefits other species but harms humans?What are two relationships that are beneficial to other species but harm humans?
all I can think of is the wild poisonous berries that birds enjoy and stay alive,.What are two relationships that are beneficial to other species but harm humans?
I can only think of one and that is parasitic.

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