Eh, it's not like it was an instantaneous event. If the symbiotic relationship first began developing a hundred million years ago, it may have taken the bacteri

Eh, it's not like it was an instantaneous event. If the symbiotic relationship first began developing a hundred million years ago, it may have taken the bacteria all this time to get to the point where they're now – organelles that are now fully dependent on the host algae cell.