If you wanted to plant a crop that would provide a good source of starch and sugar calories, and you were not in a good place to grow grain and were not worried about protein levels roots and
would provide a variety of good options

c

explanation:

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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