Over the last 540 million years, icecaps covered at least one of the earth’s poles during three intervals. when were those intervals

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Amarine ecologist has constructed the conceptual model shown in the diagram. what predictions can be made from using this model? where the tertiary consumers get their energy how often primary producers are able to reproduce when bacteria and fungi initiate the process of decomposition whether other secondary consumers are present

How can an organ, such as the lungs, work for multiple body systems?