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A biography of US President and conservation hero, Theodore Roosevet.

Plants may seem like simple organisms, but their complex systems for food production, reproduction, and protection make them some of the most highly adapted living things on the planet. From the arctic tundra to the tropical rainforests, plants dominate the land and produce the energy necessary to sustain life on Earth. Plant Cells investigates these amazing organisms and explores how they have provided cures for some of today's deadliest diseases. Plants may also play a vital role in helping to solve some of the world's most pressing problems, such as air pollution, nonrenewable resource...