Which of the following is not an example of physical evidence? testimony of the neighbor next door a knife near the accident scene fingerprints on the window footprints in the grass near the victim

I believe is

testimony of the neighbor next door

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.

it takes hundreds of years to become stable.

if you have another question lmk.