I believe that the answer is chemical energy.
Answer:
C
Explanation:
through the desk....here desk is the student's medium to hear the sound. its oblivious because when he lifts his head away from the desk he hears nothing else
Answer:
by reducing friction.....
Answer:
a machine capable of carrying out a complex series of actions automatically, especially one programmable by a computer.
You would have to put the number together
