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Which of the following is not an energy source used in metabolism?
Species Variation
Genetic differences both within and between populations of species, contributing to the diversity of organism traits.
Ecosystems
Communities of living organisms in conjunction with the nonliving components of their environment, interacting as a system.
Scientific Method
Process by which scientists formulate a hypothesis, gather data by observation and experimentation, and come to a conclusion.
Steps
Sequential phases or actions taken in order to achieve a particular end.
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