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Which of the following explains why elements, such as carbon and nitrogen, are never
permanently removed from the environment?
a. They are replenished by sunlight.
b. They are replaced by volcanic eruptions.
c. They are produced constantly by nutrients.
d. They are cycled through ecosystems.
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Answers: 1
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Which of the following explains why elements, such as carbon and nitrogen, are never
permanently re...
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