Soft-Shell Crab Is a Prized Dish in Many Ocean-Side Resorts

question 53

Multiple Choice

Soft-shell crab is a prized dish in many ocean-side resorts. Why are the crabs' shells soft?

• A) The crab has just molted and the new exoskeleton has not yet hardened.
• B) These species of crabs live under rocks and therefore have lost the hard exoskeleton over evolutionary time.
• C) These species have evolved a light and soft exoskeleton so that gases can diffuse directly between body of the crab and the surrounding water.
• D) These species have evolved a light and soft exoskeleton so that they can float in the water column.

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Definitions:

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