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Biological troubles which molluscs face

Describe the biological troubles which molluscs face due to their soft body?

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As molluscs encompass a soft body they are much fragile. They as well have more difficulty to support their bodies in terrestrial atmospheres or to fixate to substrates in the aquatic habitats. Most of the species solve such problems by secreting a calcareous carapace, or shell, an exoskeleton to support and save them and to avoid dehydration.

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