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sea slugs main food source is a specific type of "alga". the sea slugs make a cut in the alga and sucks its cytoplasm and digest most of it but retains the plastids that trap the solar energy and so on plastids continues to photosynthesize and provide food to slugs.

theree is requirement of certain gene for the process of photosynthesis.... and slugs contain at least one gene required for plastid functioning. Once slug has acquired sufficient amount of plastids it can suvive like plants for atleast nine (9) months by trapping solar energy and converrting it into food with the help of plastids.

so the required food chain for sea slugs is as :

algae (cytoplasm)-=__=------------ -sea slugs

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16y ago

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