For example if you were to have 40 birds and only 5 worms then the worms would be wiped out due too the high amount of birds so its good to keep the amount balanced via a food chain so in summary overpopulation would have a negative affect on the system
There is no "form" listed. I'm guessing Carbon dioxide.
B, coal is relatively inexpensive compared to the use of renewable energies such as solar and wind. coal also generates more energy in a shorter period of time than renewable energies.
Answer:
Sound is a type of energy made by vibrations. When any object vibrates, it causes movement in the air particles. These particles bump into the particles close to them, which makes them vibrate too, causing them to bump into more air particles. This movement, called sound waves, keeps going until they run out of energy.