What is the body of scientific knowledge based on?

Researchers want to use edna to look for an invasive species in the water which of the steps would be likely do last

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?

What if the yeast were extremely active and produced more than 100ml gas. would you know? why/why not