What is the name of the upside down looking trees that are in your lungs?
Alveolii(plural) Alviolus(singular)
Why do scientists use bat box?
Bat wants to sleep somewhere. Scientists build bat box so that bat has a nice place to sleep, much nicer than underside of scientist's car.
How do the blind use echolocation?
They can wear a device that emits a sound periodically and then listen to the difference in time and frequency of the returning sound. They can also open their mouths periodically and make a noise and listen to the echo.
How does hearing help bats survive?
The eye sight of the bats is very poor. They do not need to see anything; when they fly in night. Survival of this mammal is totally depend on the faculty of hearing. They fly in the night and produce a sound. They get the echo of the sound produced by them. From this echo, they can locate the insects, flying in the air. They can eat the same as food. They can also locate the dangers and other objects, to protect themselves.
Echo