The plant kingdom is a rich and varied world, with species such as green algae that grow on the microscopic level as well as monstrously large, imposing beauties like the giant redwood trees. Botanists, who study plant species, have identified more than 300,000 species of plants that presently exist. The existing species can be broken down into a few groups, including bryophytes, ferns, fern allies, and seed plants.

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