Question

Embryology tells us that echinoderms are more closely related to _____ than _____ A. arthropods, hemichordates...

Embryology tells us that echinoderms are more closely related to _____ than _____

A. arthropods, hemichordates

B. Chordates, arthropods

C. Nematodes, Rotiferea

D. Poriferera, Hemichordates

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Answer #1

Answer- b)Chordates, arthropods

Explanation- chordates are more closer than any other phylum. Echinoderms and chordates are classified as deuterostomes while other phyla are considered as protostomes.

Considering the embroyonic development, the first aperture that is formed in deuterostomes is primitive anus. Alternatively, blastopore is the first aperture in protostomes which develops to form mouth.Both echinoderms and chordates shows this trait. Through this, it can be assumed that the two have common ancestor and so it can be considered more closer than any other phylum.

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