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a sensation of unease and discomfort in the upper stomach with an involuntary urge to vomit. A person can suffer nausea without vomiting.
a response of the body tissues to injury or irritation. It causes pain, swelling, redness and...
the excessive growth of algae in eutrophic streams, rivers and dams.
the condition caused by a severe shortage of both energy and nutrients in the diet over an...
tissues that are responsible for the transport of substances within the plant.