What process often begins by a portion of population becoming physically or geographically separated?

i don’t no. suiopgohjk

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

since there are no options posted i'll give you a few examples.

a dolphin's flipper, bird's wing, cat's leg.

a compound light microscope is used to magnify objects in steps.  

hope it