What term describes the process of returning elements from inorganic forms to forms that heterotrophic organisms can use

the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.

c. heat from the poles back down towards the equator.

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