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3 votes
Although ______ is a practical alternative energy source, it still contributes to a pollution problem.

A.
wind
B.
the Sun
C.
bioconversion
D.
hydroelectricity

User Petabyte
by
4.3k points

1 Answer

5 votes
I think c? Hydroelectric power reduces pollution, and A, B are irrelevant.
User Tbrisker
by
4.5k points