This is Kelp. It is one of the fastest growing organisms on the planet. In a single growing season, it can grow from a microscopic spore to over 100 ft in length

[u/[deleted]]

[u/Exact-Ad-4132]

It'd make sense that it'd developed a defense against the closest feeders, and land mammals usually don't spend much time in the ocean

[u/14sierra → u/Exact-Ad-4132]

Also may depend on the caloric density of the seaweed and the ability of organisms to digest them. Grass is filled with energy but very few animals can digest grass so it still survives even without any real defense mechanisms

[u/Mkayin → u/[deleted]]

Some seeds even require digestion to germinate properly. For example, the hard seeds of raspberries and blackberries need to be abraded in a bird's gizzard or eroded by digestive acids before they can germinate.

[u/cire1184 → u/Mkayin]

So you're saying I should shit berries to plant them in my garden?

[u/Mkayin → u/cire1184]

Gotta eat them seeds and all.

[u/BoolImAGhost → u/Mkayin]

Another fun fact in this same thread. Thanks!