what are distinguishes plasmodia and cellular slime molds? What are the ecological roles of protists? Why Are photosynthetic protists so important to marine and aquatic ecosystems

What is the difference between primary algae and secondary algae?  Six major groups of algae? How are these groups classified into these groups, and what is unique about each group?   What is the difference between diatoms and coccoliths found in algae.  What is the difference between foraminiferans and radiolarians found in protozoa?  What characteristics differentiate the protozoan groups (foraminiferans and radiolarians) from the algal groups (diatoms and coccoliths) microscopicly? Of what economic and academic value are algae?

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What feature do all ‘protists’ have in common that differentiates them from fungi, plants and animals?