Technically, most ocean food chains are based not on plants, but on marine algae like seaweed and phytoplankton. Algae are no longer considered by scientists to be true plants, but rather belong to a diverse assortment of more primitive groups of organisms. If you use the word “plant” in the more traditional sense meaning anything green that makes energy from the sun however, then plants are an irreplaceable part of ocean ecosystems. Almost all ocean animals feed on algae, or on other animals depend on algae to survive. If the “plants” of the ocean disappeared, almost all animal species would quickly follow.
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