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DRUG DEPENDENCE -
Some drugs are prescribed by doctor for the prevention or treatment of a disease.
Some drugs are used for long periods.
A person becomes addict to these drugs. This is called drug dependence or drug addiction or drug habituation.
Drug dependence is of two types -
(i) Psychological
(ii) Physical
Psychological dependence is a false need.
Physical dependence is a neuro adaptation.
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Does natural selection produce an effect directly on genes, on genotypes, or on phenotypes? Explain please.
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