I believe there are two correct answers, and those answers are A and D
some ball when you bounce it it comes back up but according to gravity the energy goes away
A transverse wave. A wave is a disturbance that transmits energy from one place to another by the particles of the medium.
Answer:
f = 4000 / 30 sec = 133.3 vibrations/sec
P = 1 / f = .0075 sec period of 1 vibration
Replacement teeth were made even back then out of primitive materials, and pig hair was used like floss
