Please help me with this

a. the production of carbon dioxide through the process of photosynthesis

i think that is new experiments yield untrustworthy data and should be carefully considered, because you don't know what will happen with the experiments.

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".