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Biological troubles which molluscs face due to soft body

Write down the biological troubles which molluscs face due to soft body?

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Since molluscs have soft body they are more delicate. They also encompass more difficulty to support their bodies in a terrestrial environment or to fixate to substrates in the aquatic habitats. Many species resolve these problems through secreting a shell, calcareous carapace, and an exoskeleton to protect and support them and to prevent the dehydration.

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