PPSC Past Paper Assistant Director Punjab Employees Social Security Institution (PESSI) 2019 Solved MCQs, General Knowledge MCQs, PPSC Solved Past Papers MCQsStudy of ancestors, family history and tracing their lineage is called?A. Gerontology B. Ecology C. Genecology D. Entonomolgy History and Origin of words is?Which one of the following can be used to focus sun light?
