Was there any water on mars surface? why or why not?

According the inverse square law, doubling the distance from the source of the sound, a speaker, for example, will drop the sound 6 db each time. if you were standing in the back of an auditorium, 32 feet away from a speaker not using any amplification, would you be able to hear a speaker clearly? why or why not?

Aresident is five feet tall.what is the measurements in iches

Which describes the habitat of a frog?