Seashells/Mollusks use calcium carbonate and proteins, secreted from their mantles, to build their shells. As a Seashells grows, so does its exoskeleton. “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,” Scales writes. “Day by day, the mollusk shell slowly expands, making room for the soft animal growing inside.”

Growing Series Set

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