D. Focusing
Sound waves reflected in flat surfaces like walls, floors and ceilings results to uneven dispersion of sounds by creating locations with high intensity and another with low intensity. This process is called Focusing and can be undesirable in auditoriums.
I believe that substance would be water.
Increase in cell number for example virus
The answer is B. because lipids can make the body warmer :)))
i hope this is helpful
have a nice day
if you told me what process i could help you - post a new question and ill try to help you