An oxygen atom measure 14/100,000,000,000 of a meter across. write the width of the oxygen atom as a decimal number

How can antibodies "remember" a particular bacterial invader or "antigen" on that invader?

Most animal cell membranes have proteins that pump. ions out of the cell and potassium ions into this

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?