How do the Digestive, Circulatory, Respiratory systems work together to perform cellular
Respiration?

Explanation:

The respiratory system brings oxygen into the lungs when you breathe. The digestive system breaks food down into nutrients such as glucose. ... The circulatory system also transports oxygen from the lungs to the cells. Now the cells have what they need for cellular respiration: oxygen and glucose

i believe it would cause an increase of percipitation, though i could be wrong. so i would say b is the answer.

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