It's basically a wave that moves back and forth at regular speed through matter. because of that it transfers energy through a medium (matter). however the movement of the wave is limited because of this but it can still move over long distances. so because of this these types of waves don't move far from their original point or Equilibrium position. in short think of throwing a pebble into water and seeing the little ripples from it, that's a mechanical wave.
C. I believe this is correct
Space suits, space capsules, space vehicles, and space enviroments.
<span>It involves the use of oxygen and the release of carbon dioxide. Basically, when you breath in, the cells use the oxygen and transfer it through your body and the wasteful byproduct is the carbon dioxide that is released into the air back. Which is good because plants then use that and release oxygen.</span>
All living organisms are composed of one or more cells, per the cell theory.
