Hemichordates have now been placed with the non-chordates, close to echinoderms, because

they lack notochord

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they lack pharyngeal gill-slits

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they lack dorsal nerve cord

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they lack heart and blood vessels

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Solution

The correct option is A they lack notochord
Hemichordates have now been placed with the non-chordates because they lack true notochord. Instead they have a buccal diverticulum in pre-oral region which is often called stomochord.

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Hemichordates have now been placed with the non-chordates, close to echinoderms, because

The correct option is A they lack notochordHemichordates have now been placed with the non-chordates because they lack true notochord. Instead they have a buccal diverticulum in pre-oral region which is often called stomochord.

The correct option is A they lack notochord
Hemichordates have now been placed with the non-chordates because they lack true notochord. Instead they have a buccal diverticulum in pre-oral region which is often called stomochord.