- Life Sciences
a sensation of unease and discomfort in the upper stomach with an involuntary urge to vomit. A person can suffer nausea without vomiting.
a social structure in which different classes are determined by heredity.
(SO2) a colourless gas that smells of rotten eggs or burnt matches and is produced by...
the natural resistances with which a person is born. It occurs because of a body's genetic make-...