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    Exam 3: Ecosystems - What Are They and How Do They Work
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    The Earth's Life-Support System Consists of Four Main Spherical Systems-The
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The Earth's Life-Support System Consists of Four Main Spherical Systems-The

Question 9

Question 9

Multiple Choice

The earth's life-support system consists of four main spherical systems-the air,water,living things,and ____.​


A) ​troposphere
B) ​biosphere
C) ​geosphere
D) ​hydrosphere
E) ​atmosphere

Correct Answer:

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