Which of the following is a true statement about temperate climates? AThey often have very cold winters
BThey often have very warm summers
CThey often receive less than 25 cm of rainfall per year
DThey are usually completely uninhabited

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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".