Fill in the blank with the name of the cell structure that fits the description.
a) short, hair-like projections for movement of substances along cell surface
b) intracellularfluid
c) site of energy production by cellular respiration

wha is what i will use to get my free points

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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