Which of the following best explains why the biosphere is a key component of the earth’s systems?

a.
the biosphere is a key component of the earth’s systems because it is a common concept to many disciplines in science.
b.
the biosphere is a key component of the earth’s systems because the seasonal cycles directly affect primary productivity.
c.
the biosphere is a key component of the earth’s systems because it drive the other systems by interacting with and exchanging matter and energy with the other spheres.
d.
the biosphere is a key component of the earth’s systems because it has evolved to create the chemical composition of the planet we know today.

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