0 Crossing star theory , Modern theory of the world and difference in length of day and year November 5, 2015 by Heba Soffar · Published November 5, 2015 · Last modified September 1, 2016
The importance of the ozone layer and its structure July 21, 2014 by Heba Soffar · Published July 21, 2014 · Last modified November 27, 2017
0 Side effects of Chemotherapy after the surgery to remove cancer February 21, 2016 by Heba Soffar · Published February 21, 2016 · Last modified February 22, 2016
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