• Plants are thought to have evolved from an aquatic green alga protist.
  • Later, they evolved important adaptations for land, including vascular tissues, seeds, and flowers.
  • Each of these major adaptations made plants better suited for life on dry land.
  • The oldest fossils of land plants date back about 470 million years.
  • The first land plants probably resembled modern plants called liverworts, like the one shown in Figure below.
  • The evolution of vascular tissues revolutionized the plant kingdom.
  • It allowed plants to grow large and endure periods of drought.
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