Horseshoe crabs are one of the only five living species of arthropods class a) merostomata b)chelicerata c)arachinda d) none of the above

A.  merostomata

Horseshoe crabs are merostomata class

Explanation:

Merostomata is one of the five class of the phylum arthropoda. Horseshoe crabs are not crustaceans. They are the only living representative of a group that flourished successful over 300 million years ago on the earth. They have lived in the coasts of North America and Southeast Asia.

Taxonomy:

PHYLUM:  arthropoda

SUBPHYLUM: chelicerata

CLASS: merostomata

ORDERS: xiphosura

FAMILIES: limulidae

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answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]