An aquatic living fossil, with ancient origin and many primitive characters which respires through book lungs is ________.

Limulus

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Cancer

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Lucifer

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Daphnia

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Solution

The correct option is A
Limulus

A. Limulus- Respires through Book gills (Book lungs). The Atlantic horseshoe crab (Limulus polyphemus), also known as the American horseshoe crab, is a species of marine and brackish chelicerate arthropod.

B. Cancer- Respires through gills.

C. Lucifer- Respires through gills.

D. Daphnia- Respires through diffusion.

So, the correct answer is 'Limulus'.

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