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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 …

…tissues which transports sugar to parts of its body and uses its pigments to absorb blue-green light. II. Green Algae: Come in both unicellular, multicellular, and intermediate forms. A: Unicellular green algae: Independent cells which conduct their own photosynthesis. B. Multicellular green algae: Daughter Cells in these algae do not seperate. C. Intermediate green algae: Colonies are forms of intermediate green algae. Although colonies are joined by cytoplasmic strands they can function independently. ------------------------------------------------------------------------ **Bibliography**