Please help I’ll mark you as brainliest if correct! #2

answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle cells;

oxygen +1 most likely

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".