What property of the Prochlorophyta makes the Prochlorophyta much more likely to be the progenitors of true plants than blue-green algae?
Possessing both chlorophyll a and b, the Prochlorophyta have a pigment system that resembles the system of land plants much more closely than does the pigment system of the blue-green algae. Thus, it has been hypothesized that the Prochlorophyta are the progenitors of the eukaryotic chloroplasts.
