Examlex
Snowball sampling would be an effective strategy for a researcher to use if a researcher was interested in studying a population of gang members.
Foreign Substance
Any material or substance that is not naturally part of an object or body and may be harmful or benign.
Disease-causing Agent
An organism or substance that is capable of producing disease, such as bacteria, viruses, or toxins.
Lymphatic Vessels
A network of thin tubes that transport lymph, a fluid containing infection-fighting white blood cells, throughout the body.
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