Which was a main force driving extensive speciation when the environment became hospitable to life after the Permian mass extinction? A. increase in available ecological niches
B. increase in genetic diversity among surviving organisms

the darker peppered moth species were favored due to the fact that the industrial revolution had made all the nearby trees a darker color instead of white.

lipid

explanation:

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

answer; both surfaces of the membrane are nonpermeable