Cellulose-digesting microorganisms live in the guts of termites and ruminant mammals. the microorganisms have a home and food, and their hosts gain more nutrition from their meals. this relationship is an example of
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the sun is the primary source of energy for earth's climate system is the first of seven essential principles of climate sciences. principle 1 sets the stage for understanding earth's climate system and energy balance. the sun warms the planet, drives the hydrologic cycle, and makes life on earth possible.