A model organism is a species that has been widely studied to understand a particular biological phenomena, normally used because they are easy to breed and maintain in a laboratory setting and has certain experimental advantage.
The criteria that Thomas hunt Morgan was looking for include; the model organism should be small in size, easy to keep in the laboratory and also able to produce large number of off springs in a short time.
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<span>A special interest group work hard to get a rider attached to a bill b</span>ecause many special-interest groups try to get something unrelated into a bill and to benefit the group.