What are producers exactly?

Explanation:

Producers are organism that produce their own food, they are called autotrophs. Plant are example of producer they produce their food through the process of photosynthesis.

Photosynthesis is the process in which green plant uses energy from sunlight with Cabondioxide and water to produce glucose(sugar) and oxygen used for their body activities. Algea are not plant but can also produce their own food. Heterotrophs do not produce there own food but depends on producers and other organic compounds for their own food.

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explanation:

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not only is it colder, it also becomes darker, less salty, and more dense.