Which of the following would be the BEST location for a hydro-electric power plant?
A) in a dry, open field that receives direct sunlight
B)near a large river with a waterfall
C)beside a small, human-made pond
D)in a dense and fast-growing forest

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".

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