The horseshoe crab breathes by means of its

Book lungs

Explanation:

The horse shoe crab has a hard outer surface carapace which has the shape of a horse shoe.

It has book lungs which come in 5 sets. The lungs are usually found on the ventral side of the crab.

The book lungs acts as gills which is used in breathing when the horseshoe crab is in water . The book lungs also helps the crab to breathe on land for a certain period of time provided the lungs are moist.

the answer is b: 1.4 km/hr

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