Further practice

For learning more, go to these webpages and enjoy:

Drolly (2011)Characteristics of life http://www.youtube.com/watch?v=iuUzQW29Aw8&feature=related

Sfgres (2010) http://www.youtube.com/watch?v=juxLuo-sH6M&feature=related

The characteristics of life, taken from http://www.youtube.com/watch?v=uM_CgOgJGG0&feature=related retrieved August 23 2012