What did the Miller-Urey experiment demonstrate?

Advances in technology have enabled scientists and researchers to better study the evolutionary relationships between species

How many types of rock can form from the rock cycle

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?