How many amino acids are responsible for building proteins?.

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

Which statement best describes how the loudness of the sound affects the high-pressure region created by the sound wave? a. a louder sound has no effect on the pressure created. b. a louder sound means a high-pressure region that is higher. c. a louder sound means a high-pressure region that is not as high.

Moving down the ramp from 6 meters to