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SIXTH GRADE PLANT LIFE - msnucleus.org

The study of plants is called botany or plant biology. Biologists believe that the plants that live on the land today are descendants of tiny green plants that lived about 350 million years ago in the ancient seas. Plants are divided into two major groups: the nonvascular (Bryophytes and Thallophytes) and the vascular plants (Tracheophytes).