Modern algae are decendents of early photosynthetic eukaryotes which began to appear on the Earth over 1.5 million years ago. Algae are classified into six divisions based on their photosynthetic pigments, reserve food supply, and cell wall composition. In these six divisions of algae, three groups are multicellular and three groups are unicellular. Unicellular forms of algae include diatoms, euglenoids, diatoms, dinoflagellates, and many forms of green algae and they form plankton, a major food source for many aquatic animals. Multicellular algae, including, brown algae, red algae, and some green
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