THe population will become a separate species over time. This is speciation.
It sends an electrical impulse to make your heart beat. The job of a pacemaker is to artificially take over the role of your sinus node if it isn't working properly. Electrical impulses are sent by the pacemaker to stimulate your heart to contract and produce a heartbeat
Energy just exists.
It goes from one thing to another. It never dies out.
We get our energy from the burning mass of the energy ball that we call the sun.
A. Carbon, oxygen, and nitrogen are vital components of life on Earth