Keeping doors and windows closed the environment because

a: it conserves heat energy in winter and cool air in summer

b: it eliminates residential dust from entering the atmosphere

c: it is an easy and important fire safety action

d: it prevents pollutants from entering the home

fas

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.