Which statement best describes the purpose of Earth's spheres?
They work together as open systems to cycle matter through ecosystems.
They work independently as closed systems to cycle matter through ecosystems.
They work together as open systems to move matter to living and nonliving parts of Earth.
They work independently as closed systems to move nutrients to living and nonliving parts of Earth.
Answers: 2
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Which statement best describes the purpose of Earth's spheres?
They work together as open systems...
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