• Sound is the transfer of caused by any material. sound is carried by waves, which pulse out from the of the disturbance.
sound waves are waves that need a medium to travel through.
there must be to vibrate fot sound waves to travel​

Which of the following is a main difference in cell structure between an onion cell and a human cheek cell? a. an onion cell contains one nucleus, whereas a human cheek cell contains two nuclei. b. an onion cell has a cell wall. c. a human cheek cell contains chloroplasts. d. there is no difference between an onion cell and a human cheek cell. you for your.

Alaska and northern canada have a diet rich in vitamin d and their skin color is darker than predicted on the basis of iv intensity at their latitude. explain the observation:

Which of the following is a common danger of commercial fishing?