The primary is the sun
The sun is the main source of energy on earth.
Sunlight is the main source of energy on earth
the sun is the main source of energy of the earth the sun is the main source of energy of the earth the sun is the main source of energy of the earth
Sunlight is the main energy source for life on earth.
The Sun is the primary source of all energy on Earth.
Chlorophyll is the source of all food energy on the planet earth.
sun
the sun
We get most of our energy from the Sun.
We get most of our energy from sunlight.
solar energy