Plant obtain energy through photosynthesis .They are producers because they are able to obtain synthesize their food . Animals on the other hand are consumers and must obtain their energy by consuming organic matter such as plants and animals .
Explanation:
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Eutrophication (from Greek eutrophos, "well-nourished") is the process by which an entire body of water, or parts of it, becomes progressively enriched with minerals and nutrients. It has also been defined as a "nutrient-induced increase in phytoplankton productivity". Water bodies with very low nutrient levels are termed oligotrophic and those with moderate nutrient levels are termed mesotrophic. Advanced eutrophication may also be referred to as dystrophic and hypertrophic conditions. Eutrophication in freshwater ecosystems is almost always caused by excess phosphorus.
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The SHC of water means it takes a lot of energy to raise its temperature (specifically joules per kilogram degree Celsius), but it holds that temperature for a long time.
Oxygen did.....filling up space