Embryological studies suggest that the most ancient chordates were related to the ancestors of:

They truly are about echinoderms.

Response is echinoderms

The clear answer is Echinoderms.

Embryological researches declare that probably the most old chordates had been about the forefathers of echonderms

Embryological researches declare that probably the most old chordates had been about the forefathers of d) echinoderms.

Answer 6

In line with the Embryological researches, probably the most old chordates had been closely about the forefathers associated with the echinoderms. Echinoderms tend to be people in the team Phylum Echinodermata of marine pets. Some understood echinoderms tend to be starfish, and ocean cucumbers.

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