This diagram depicts a hypothetical ancestor for one of the major animal phyla that we studied....
This diagram depicts a hypothetical ancestor for one of the major animal phyla that we studied. Nephridium Visceral mass Heart Coelom Intestine Gonads Mantle Mantle cavity Stomach Shell Radula Mouth Anus Gill Radula Mouth Foot Nerve Esophagus cords Which phylum? Defend your answer. (How do you know which phylum?) Since this is only a hypothetical ancestor that is not based on any direct evidence, how can we guess that it might have looked like this?