Scientists believe that green algae, chlorophyta, are the ancestors of land plants. volvox, a green algae, gives us a clue to this progression in plant form because, as seen here
a) single cells joined together to form a unique colonial body form.
b) volvox has an advanced body structure with cells, tissues, and organ systems.
c) single cells, that can no longer live independently, joined to form a colony.
d) volvox colonies are organized on the organ system level much life flowering plants.