Birds have light-weight bones, wings, and feathers that are that allow them ti fly. They type and shape of their beaks help them to fulfill their in the environment.

Birds have light-weight bones, wings, and feathers that are hollow that allow them to fly. The type and shape of their beaks help them to fulfill their duties in the environment.

it would be the percentage of food eaten by the flock

i remember doing this lab

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.