On a hot summer day in the desert, temperatures are often hotter than 110 degrees F (43 degrees C). If the heat is not bad enough, there can be weeks and months without a drop of rain. How do desert plants like the Saguaro Cactus survive in such difficult conditions? Dr. Biology talks with Tina Wilson from the Desert Botanical Garden in Phoenix Arizona. He gets the inside story behind plants that keep their cool in the desert.

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