What is this close-up picture? (WotsThat: Sand dollar surface (macro))

Question

What object is shown in this zoomed-in close-up photo?

VanadiniteX · Accepted Answer

Sand dollar surface (macro). When you zoom in on a sand dollar's surface under a microscope, you'll discover thousands of tiny tube feet that look like miniature suction cups, and these aren't just for show—the sand dollar uses them to taste its surroundings and detect chemicals in the water to find food. Even more wild, some species can use these same tube feet to bury themselves in sand in less than a minute, essentially "walking" sideways into the seafloor like a living submarine.

Answer: Sand dollar surface (macro)

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