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यह सर्वेक्षण राजकीय बालिका उच्च प्राथमिक विद्यालयए करकेडीए किशनगढए राजस्थान की आठवी कक्षा की छात्रा बीना के द्वारा किया गया। By: ashok kumar! Created By School Address Email Class बीना राजकीय बालिका उच्च प्राथमिक विद्यालय करकेडी, किषनगढए राजस्थान आठवीं कक्षा Read More …

The first patent on a ballpoint pen was issued on 30 October, 1888, to John J Loud. The pen proved to be too coarse for letter writing, but it could be used to mark rough surfaces, especially leather & was Read More …

Originally, the process in which male gametes, the spermatozoa, are collected and introduced artificially into the female genital tract for the purpose of fertilization. Other artificial methods for achieving fertilization have since been devised By: ranjit kumar! Created By School Read More …