PPSC Assistant Agricultural Department 2018, Everyday Science MCQs, PPSC Solved Past Papers MCQsWhat is the largest source of oxygen on earth? Posted on August 7, 2021 by adminA. Algae B. Tree C. Water D. LeavesShare 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)
