Question

what are the factors responsible for sustenance of life on earth

Answer 1

radiation, and provides chemicals needed for life, such as nitrogen and carbon dioxide. Small planets and moons have insufficient gravity to hold an atmosphere. The gas molecules escape to space, leaving the planet or moon without an insulating blanket or a protective shield.

Answer 2

The inert components of an ecosystem are the physical and chemical factors necessary for life—energy (sunlight or chemical energy), water, heat, atmosphere, gravity, nutrients, and ultraviolet solar radiation protection.

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