1 overpopulated animal in the Amazon rainforest

Draw the structure of dna nucleotide with adenine as nitrogenous base

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?

Ascientific idea becomes valid when it is what?