mutation
mutation
mutation
mutation
The sun is the ultimate source of energy for almost all earth ecosystems.
The sun is what is the ultimate source of energy on Earth. Without it, all would die.
the sun.
the sun
the sun.
The SUN!
The sun.
plants are not the ultimate source of energy. It is the sun which is the ultimate source of energy to this planet
The sun is the ultimate source of all energy in Earth's ecosystems.