If a star's surface temperature is 2900 kelvin , half of our sun's current temperature, then the output energy of the star is: a. half the output energy of the sun b. fourth the output energy of the sun c. sixteen times less than that of the sun d. none of the above

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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".