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the thin moist surface across which gaseous exchange occurs.
pigments that occur in the brightly coloured, yellow, orange or red parts of the plant, such as...
a drug that inhibits (slows down) the action of the nervous system.
a sensation of unease and discomfort in the upper stomach with an involuntary urge to vomit. A...
a prolonged period of low rainfall which has a negative effect on plant, animal and human life...