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a perforated wall or part of a wall at the end of one of the individual cells making up a sieve tube.
(also called caustic soda) a white solid, available in pellets, flakes or granules, with the...
competition between organisms of different species.
any disease that is caused by a virus or a bacterium or any other micro-organism.
meristem that produces a layer of bark on the outer surface of a plant.