It is advantageous for animals that migrate to store energy in the form of lipids rather than carbohydrates. this is because a) lipids do not form polymers. b) lipids are more dense than carbohydrates. c) carbohydrates do not supply energy to cells. d) lipids weigh less and store more energy (gram for gram) than carbohydrates.

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.