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I think it formed in the tertiary because that's when the first flowering plants formed, however, it could also be the Devonian because that was the age of fishes.

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12y ago
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13y ago

Seaweed is an alga of the kingdom Protista. Some varieties of algae are unicellular but all protists originated from prokaryotes.

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13y ago

About 3billion years no lie.

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Q: Where did seaweed originate from?
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