PPSC Past Paper Social Security Officer in PESSI – Labour and Human Resource Department 2018 Solved MCQs, Everyday Science MCQs, PPSC Solved Past Papers MCQsOrnithology is a branch of science that concerns the study of? Posted on June 12, 2021 by Rana TahirA. Plants B. Birds C. Amphibians D. AntsShare this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on WhatsApp (Opens in new window)Click to share on Pinterest (Opens in new window)Click to share on LinkedIn (Opens in new window)