Por que el transporte de oxigeno es más eficiente en los sistemas circulatorios cerrados? Why is oxygen transport more efficient in closed circulatory systems?

The closed circulatory system considerably enhances the speed, precision, and efficiency of the circulation. The blood flows far more rapidly and it takes less time to circulate through the closed system and return to the heart.

the answer is; comparing the frequency of collisions with and without the device

this makes the anti-collision system an independent variable and the collisions a dependent variable. if there are fewer collisions with an anti-collision system that without, then it can be stated that the system is a success. essentially, collisions under an anti-collision system are compared with the frequency of collisions by cars with the human drivers.

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