Why is double loop circulation better for larger, more active animals than single loop circulation

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.

a=c and then d= c because of the band so you get ac/dc and you add them together you get sound waves