Resin produced by conifer trees protects from mechanical or insect damage because it flows, then hardens to seal the wound site.

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“Conifers protect their trunks from mechanical damage and insect attack with a special gummy substance, resin. When it first flows from a wound it is runny but the more liquid part of it, turpentine, quickly evaporates leaving a sticky lump which seals the wound very effectively.” (Attenborough 1979:76)

The Private Life of PlantsAugust 21, 1995
David Attenborough

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