Explain the feedback mechanism that control ventilation and circulation to include the peacemaker of the heart

an adaptation is a change or process by which an organism takes to be better suited for its environment. for example; migration is a behavioral adaptation, this is needed because birds are not built to last extremely cold climates. there are different adaptations because there are different species needing to adjust to different things, bears don't migrate; they hibernate.

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

several tissues working together form an organ, and several organs together make up an organisms.

the group of cell that carries out special jobs are tissue.