What are the biological troubles that molluscs face due to their soft body?

What are the biological troubles that molluscs face due to their soft body?
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Because molluscs have a soft body they are more fragile. They also have more difficulty to support their bodies in terrestrial environments or to fixate to substrates in aquatic habitats. Many species solve these problems by secreting a calcareous carapace, or shell, an exoskeleton to support and protect them and to prevent dehydration.
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