Kelp

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Description (from Recipaedia)

Kelp is undersea plant attached to the sea bottom that reaches up to get access to sunlight. Watch out when swimming because you can get entangled and drown.

Notes

Be careful not to be in contact with kelp because you can get entangled and become vulnerable to drowning.
Kelp grows at least 2 blocks deep in water.
Kelp can be found in many climate. Freezing cold water and desert water can have kelp.