The blade of a giant kelp is ridged. These ridges give the blade strength and durability, just like the ridges of corrugated cardboard. Both giant kelp and bull kelp are photosynthetic, and use their blades to collect and absorb sunlight near the ocean surface.

Photograph by Melissa Zepeda, MyShot
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Kelp is a giant seaweed that grows in two forms along the west coast of North America—giant kelp and bull kelp.