Match it to the right one

What is the next step in muscle contraction after the actin changes shape? (apex)

What is used to keep track of the gamates and possible offsprings combination

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?