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a microscope that uses light to produce images.
a serious and potentially fatal medical state caused by an allergic reaction, in which sufferers...
a social structure in which different classes are determined by heredity.
the cylinder of parenchyma found from the centre of the stem to the inside of the vascular...
unicellular organisms that contain a true nucleus and membrane bound organelles. All protists...
the complete set of alleles (different forms of genes) making up the genetic material of a...