I found out a link on internet which challenges the ayats related to human embryo in Quran, http://webcache.googleusercontent.com/search?q=cache:s52L3r6ogrQJ:www.answering-islam.org/Quran/Science/embryo.html &cd=3&hl=en&ct=clnk One of my friend who is muslim by birth but now have stopped believing in Islam and Quran. He challenged me to find out the answer to prove the authenticity of Quran e Pak.