Embryology

A fully formed ready to develop embryo is only a few centimetres in the womb at the end of 5th week. How could Quran 1400 yrs ago accurately described it in detail without the ultrasound or other scopes levied to us today? In such a scenario could you afford to doubt while it composes further to explain us resurrection by this clear similitude …and [further], you see the earth barren and lifeless, but when we pour down rain on it, it is stirred [to life], it swells, and it puts forth every kind of beautiful growth [in pairs].