The spiral of a seashell

Seashells are exoskeletons. The soft mollusk that lives inside oozes out a secret mixture of calcium carbonate, proteins, and mystery to create the shell. Scientists still do not know how the mollusks create the pigments to colour their shells.

They are dedicated home improvers, constantly expanding their living space as they grow.
“They are among the few animals on the planet that wander around carrying with them the same body armor they had as babies; the pointy tip or innermost whorl is the mollusk’s juvenile shell….
“Day by day, the mollusk shell slowly expands, making room for the soft animal growing inside.”
Spirals in Time, by Helen Scales (a book on my wishlist)

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