If you flip a penny, the chance of it turning up heads is
a.)predict the phenotypes of a monohybrid cross
b.)predict an unknown genotype of a purebred dominant plant
c.)cross-breed dominant and recessive plants
d.)give probabilities that a trait will appear

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.

i am going to guess that it is co2.