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rain that contains high levels of sulfuric acid, hydrochloric acid and nitric acid.
emitting (or giving off) radiation energy, which is harmful to living organisms.
animals with two cellular body wall layers: the ectoderm and endoderm.
the cylinder of parenchyma found from the centre of the stem to the inside of the vascular...
small structures found in the jaw that are used for biting and chewing food.