C. The lungs can better exchange oxygen
Answer:
The answer is between a or b
but I strongly suggest the option a.
Evolution is the answer
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.
Pro cells have cell wall but eukar don’t
An open flame or burning flame
