Why are organisms like plants and plankton important to the ecosystem?

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LARGER ORGANISMS FEED OFF OF THE SMALLER ONES CREATING A FOOD CHAIN

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How is plankton important?  What are the important thing about plankton?  Number of different organisms in an ecosystem?  Why are the tiny plankton so important to ecosystem?  Why are plants an important part of the forest ecosystem?  The types and numbers of plants in an ecosystem determines what?