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The Sun is the main and most important energy source.
solar energy
nonrenewable sources of energy
Coal
The sun.
Fossil fuels.
solar energy and win energy are the most environment friendly because the are renewable source of energy.moreover they are present in abundance.whereas water is also a renewable source but it is more difficult to renew it.hence solar and wind energy are the best option.
The mining and burning of coal is the most damaging to the environment.
The nuclear energy is now the most important source of alternative energy.
The source of energy for most organisms is chemical energy and sunlight.
fule fossile is the most used energy source
The Sun is the main and most important energy source.
Nuclear energy that is the source of sun energy which in turn is the source of fossil and renewable energies.
The sun is the main source of energy on earth.
The carbohydrates are the main source of energy from the food you eat, becausethey are most easily converted to useable energy. Fats are the second energy source used.Proteins are the third and most difficult source to be converted to energy.
Glucose is the most common energy source in cellular respiration.
proper environment (temperature, humidity, salinity, etc.) source of oxygen (most of the time) source of energy (food) source of minerals all of these dependent on the type of organism.