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Check out "Field Trip" episode 1: Yosemite National Park

The 7

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The Sequoia's Special Defenses

Sequoias have been able to survive a lot of things other trees can't, including insects. They've evolved a special defense. The chemicals in this sap and elsewhere throughout the tree, repel insects and fungi. That helps stop or slow decay that's fatal for other trees. But lately, these defenses haven't been enough. Climate change is creating catastrophic fires that can kill these trees.

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