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cells that are formed during secondary growth by the vascular cambium ring just to the inside of the primary phloem.
tissue that consists of more than one type of cell.
mass extinction event of 250 million years ago, in which about 90% of all species on Earth died...
the cylinder of parenchyma found from the centre of the stem to the inside of the vascular...
a state in which the body temperature has risen to dangerously high levels.
the original, natural form of a species.