What is this close-up picture? (WotsThat: Whelk shell spiral (macro))

Question

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

PixelLynx · Accepted Answer

Whelk shell spiral (macro). A whelk is a sea snail, and like other spiral-shelled molluscs it grows its shell by adding new material only at the open edge, so the tip of the spiral is actually the oldest part of the shell.

Answer: Whelk shell spiral (macro)

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