The image of a slide of onion epithelial tissue observed with the low-power objective of a compound microscope appears light and somewhat fuzzy. Which parts of the microscope should be used to improve the focus?
coarse adjustment and ocular
fine adjustment and diaphragm
ocular and nosepiece
diaphragm and 40x objective
Od

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".