What’s the difference between kelp and seaweed?

Trick question! Kelp is a type of seaweed. There are over 15,000 species of seaweeds, grouped in three main categories: brown, green, and red seaweeds. Brown seaweeds are commonly called kelp. And if you were wondering, spirulina is seaweed’s tiny cousin. While all seaweeds are macroalgae, spirulina is a type of microalgae.
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