4.2

4.2地理和氣候的改變如何影響天擇

http://tw.youtube.com/watch?v=6naOt2RujuA
http://tw.youtube.com/watch?v=ft-dP2D7QM4&feature=PlayList&p=200C89D39EF80E3F&playnext=1&index=2 http://tw.youtube.com/watch?v=QDqskltCixA&feature=PlayList&p=200C89D39EF80E3F&index=3&playnext=2&playnext_from=PL