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Which of the following animal groups is correctly paired with its characteristic?

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Porifera - Central cavity called spongocoel lined by pinacocytes

Mollusca - A soft and spongy layer of skin forms a mantle over the visceral hump

Cnidaria - Gastro-vascular cavity with two openings

Arthropoda - Mostly monoecious and viviparous

answer is B.

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Detailed Solution

A soft and spongy layer of skin forms a mantle over the visceral hump in molluscs.

Spongocoel is lined by choanocytes (not pinacocytes).

Gastro-vascular cavity has a single opening, mouth on hypostome.

Arthropods are mostly dioecious and mostly oviparous.

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