Why is the beak of a bird important?

The beak of a bird is important because it helps the bird eat certain foods that allow it to live. If a hummingbird did not have a long , thin beak, it would not get the flower nectar it needs. Or if a parrot did not have a large, blunt beak, it would not be able to eat hard seeds.

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.