'''<span style="font-size:20px;">External links</span>'''<br/> Denis Noble:&nbsp;[https://www.youtube.com/watch?v=hS6PDOcJwY8 What is life"-lecture: Denis Noble - YouTube]<br/> [https://www.youtube.com/watch?v=QOCaacO8wus What Is Life? Is Death Real? - YouTube]<br/> [https://www.youtube.com/watch?v=tsVHWbXqum8 What are Chromosomes? - YouTube]

[[What_is_DNA?|What is DNA?]]<br/> &nbsp;