19
QuizMultiple Choice

Topic Test

Question 19 • 2025-2026 Phillips Environmental Science A 2nd semester

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

Answer
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 helps 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.

Explanation

The biosphere includes all living things, which interact with the atmosphere, hydrosphere, and geosphere. These interactions transfer matter and energy, helping drive processes across Earth’s systems. Seasonal cycles do affect productivity, but that is only one influence and does not best explain the biosphere’s overall importance.

AI-written and checked against the verified answer.

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