Conifers are an ancient lineage of plants, dating back some 290 million years. Most conifers are trees, though a few grow as shrubs. Many, though not all, are evergreen. Some conifers produce a resin which oozes from their trunk and branches protecting them from attack by insects and fungi. There are about 600 conifer species, and they boast both the world's tallest tree and its oldest in their number.
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