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identical strands of a chromosome produced by the doubling of genetic material during cell division.
highly addictive substance found in tobacco that accelerates the heart rate, and contracts and...
two species that interact symbiotically in a relationship that is beneficial to both species....
the process whereby a particular change causes a response which reverses that change.
(also called vascular tissue) the tissues that transport water and dissolved food in a...
the condition caused by a severe shortage of both energy and nutrients in the diet over an...