Were you able to observe the nucleolus in any of the cells? if so, which ones?

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.

meteorologists would compare a new weather map with one 24 h old to see how fast a front is moving.