Chapter II Review of Related LiteratureThis chapter includes the review of related literature and foreign and local studies on which the researchers pursued the topic about the particular study.Foreign LiteratureLocal LiteratureForeign StudiesLocal StudiesWorld Health Organization (2003), it is estimated that up to 80% of the population depends exclusively on plants for their health and healing The information and folk knowledge regarding the medicinal and therapeutic uses of these indigenous plant materials have been handed down from generation to generation through verbal communication.

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