The diagram shows a general representation of an energy pyramid for a living system. as energy flow through the pyramid, a. 25% of energy is gained at each increasing trophic level. b. 10% of energy is lost at each increasing trophic level. c. energy remains the same at each trophic level. d. energy increases at each trophic level.

multiplying and dividing the two decimals and the eqations by the same number of the overalls

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".