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Bristlecone pines can grow to such great ages (over 4,000 yrs!) because of adaptations that allow them to conserve moisture, grow slowly, and begin growth each season as soon as moisture and temperature conditions are adequate. One of the adaptations that allows for such great age is that Bristlecones can continue to grow while parts of the bark die back and produce partial rings instead of complete ones. As part of the bark dies back, pitch is deposited in the trees' woody parts, preserving the wood and reducing moisture loss. |
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