A large and diverse group of autotrophic organisms that range in size from unicellular to gigantic multicellular forms. They contain different types of chlorophyll and obtain food via photosynthetic activities. Unlike plants, they don't have root, stem or leaves. They can move freely or spend life attached to the rocks or sea bottom. Morphologically, they can be classified in couple of level of organisation: colonial, capsoid, coccoid, palmelloid, filamentous and parenchymatous types. Algae can reproduce asexually, via simple cellular division, or sexually, via complex forms of reproduction. The most complex forms of marine algae are called seaweeds. Algae are very old organisms, their fossils are dating back to 1.6 to 1.7 billion years ago.
What is ALGAE?
ALGAE: "Algae lack morphological structures that characterize land plants."
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