In snails, the hard calcareous shells are secreted by the

In snails, the hard calcareous shells are secreted by the

Answer Details

The hard calcareous shells in snails are secreted by the mantle. The mantle is a tissue layer that covers the internal organs of the snail and produces the shell by secreting calcium carbonate. As the snail grows, the mantle continues to secrete more calcium carbonate, which gradually builds up to form the spiraled shell that we see.