Consider the Figure Below

Multiple Choice

Consider the figure below.What does the arrow pointing from cyanobacteria to plants and algae indicate according to the endosymbiotic origin of eukaryotic cells?

A) Cyanobacteria are the early evolutionary ancestors of plants and algae.
B) Cyanobacteria merged together to form plants and algae.
C) Cyanobacteria serve as a common source of energy for plants and algae.
D) Cyanobacteria were internalized by early cells to form the chloroplast present in plants and algae.