The answer is Echinoderms.
According to the Embryological studies, the most ancient chordates were closely related to the ancestors of the echinoderms. Echinoderms are members of the group Phylum Echinodermata of marine animals. Some known echinoderms are starfish, and sea cucumbers.
<span>Preservation of advantageous genetic mutations, I think.</span>
The answer will be B. It is common sense
I think it would be the sclereids cells
