Which statement best describes echolocation in bats?

echolocation bats find food only.
echolocation bats find food and avoid flying into obstacles.
echolocation bats avoid flying into obstacles only.
echolocation is not used in bats.

Echolocation helps bats find food and avoid flying into obstacles.

B. Echolocation helps bats find food and avoid flying into obstacles.

the entire statement is true and correct.  

there's no diagram, nothing is illustrated, and no question is asked.

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.