Based on her survey, which advertising mediums will work best to publicize leslie's in-store specials?

littering streams           is the answer

answer; polycythemia is the correct answer;

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.