Molluscs are among the most diverse and widespread groups of invertebrates and are mainly marine animals, very variable between each other in terms of morphology and way of life.

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Plants include the Algae, unicellular or multi-cellular organisms with a simple structure, and the Embryophytes (terrestrial plants).

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Si tratta di organismi unicellulari diffusi nei mari di tutto il mondo e nelle acque dolci, sia planctonici (trasportati passivamente dalle acque) che bentonici (abitanti dei fondali).

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