Which best describes a fossil that helps determine the relative age of a rock layer? A. Trace fossil B. Index fossil
C. Radioactive fossil
D. Unconformity fossil

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?