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How can the shell of a snail grow up altogether with its body?

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To expand on Jürgen Pietsch's answer, here's an adult snail: The outline shows what its shell was when it was a teenager: And here's what its shell was when it was a baby: Source: File:Grapevinesnail 01.jpg. read more

Snails add new material at the edge of the shell, so over time the number of whorls increases. The small shell of a young snail is still there in an adult snail, its the part in the very center. read more

A baby snail begins its calcium-rich diet by eating the shell of the egg it hatched from, a convenient source of nutrients. As the snail continues to grow, its shell grows with it. The snail produces new shell material, like the soft material of its protoconch, that expands its shell and then hardens. read more

Snails spend a long time in their shell when the weather is hot and dry. Otherwise, their moist bodies could dry out. Snails vary in size and color. The largest are members of the family Achatinidae, of which the species Achatina achatina can reach a length up to 11.8 inches and a diameter up to 5.9 inches. Internal anatomy. Inside, the body of the snails lack divisions. read more

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Facts about Snails
www.snail-world.com

Slugs and Snails Facts
www.dkfindout.com