How would sound be affected if there was no matter to vibrate? The sound would have a higher pitch.

The sound would have a lower pitch.

The sound would be louder.

There would be no sound

Natural selection changes allele frequencies because some survive and reproduce more successfully than others.

An uncomfortable feeling in the ears when descending in an airplane is caused by changes in air pressure on the: a. inner ear b. middle ear c. eardrum d. hammer/anvil

5. what might happen if you were to remove all light from the setup after the discs have all become buoyant? describe what you would see. explain why this would occur with relation to cellular processes like respiration. [referring to an ap biology lab in which spinach discs are placed in a sodium bicarbonate solution and exposed to light.]