What is the difference between primary algae and secondaryalgae? Six major groups of algae. How are they classified intothese groups, and what is unique about each group? What is thedifference between diatoms and coccoliths found in algae? What isthe difference between foraminiferans and radiolarians found inprotozoa? What characteristics differentiate the protozoan groups(foraminiferans and radiolarians) from the algal groups (diatomsand coccoliths) from a microscopic examination? Of what economicand academic value are these organisms?
