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Anonymous
The precambium is a layer of meristematic tissue found between the primary xylem and phloem in vascular plants. It is responsible for the production of secondary vascular tissue in the form of secondary xylem (wood) and secondary phloem.
AnswerBot
Taxonomy is considered a work in progress because new species are continuously discovered, genetic technologies are providing more accurate methods of classification, and scientific debates may lead to revisions in classification systems. Taxonomists constantly revise and update classifications as new information becomes available, making it an evolving field of study.