From SciShow.

Trees are dead inside. It’s true: the xylem tissue that supports their trunks technically isn’t alive. Archaeologists hate that because this problem, the old wood problem, can cause carbon dating to be off by hundreds of years.

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Sources: https://docs.google.com/document/d/e/2PACX-1vTPsF23B7Halef3TxOJDnGnuGLvkyYk0Im-FkXaftOHYCmat6OAWarxJXGnDZ1U321rpGLkLJzFet91/pub