Many scientists theorize that life arose on its own, starting with very simple forms that gradually, over millions of years, became more and more complex.
يفترض علماء كثيرون ان الحياة نشأت من تلقاء ذاتها ،‏ بدءا بأشكال بسيطة اصبحت تدريجيا معقدة اكثر فأكثر بمرور ملايين السنين .‏