7º ano/ Pteridófitas

http://www.youtube.com/watch?v=M7uVqyHGWTM

http://www.youtube.com/watch?v=XWRPNZGz5Rw

http://www.youtube.com/watch?v=nLRy7t8T0W4

http://www.youtube.com/watch?v=KMSGLE5jx7c