(preferably more than one sentence) why do we care about ocean acidification?

Apart of an ecosystem that can restrict the growth of a population is referred to as

What are examples of the plant life and animal life that can be found in each type of terrarium

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?