Research and Development.
Answer:
the significant of carbon.A compound found mainly in living things is known as an organic compound make up the cells and other structures of organism and carry out life processes.Carbon is the main element in organic compound,so carbon is essential to life on earth
B. Electrical, chemical, thermal, mechanical.
Turning the ignition switch on sends an electrical signal, which starts the chemical combustion of the fuel. This gets the engine going, which produces heat (thermal).