... divided known life forms into Kingdom Plantae, Kingdom Animalia, Kingdom Fungi, Kingdom Protista, and Kingdom Monera. In the 1970's, Carl Woese began collecting evidence (in the form of ribosomal RNA sequences) that life branched very early into three lines. Today, due to the work of Woese, many biologists consider all the known living things to represent a "tree of life" with three main braches. Each branch is ... some form multicellular aggregations commonly called seaweed. Single celled forms are collectively called phytoplankton and they are responsible for about 70% of all photosynt...

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• Grade Level: High School