Research it:
http://studyjams.scholastic.com/studyjams/jams/science/index.htm?topic_id=animals
https://www.bbc.co.uk/bitesize/topics/zn22pv4/articles/zp6g7p3
http://www.sheppardsoftware.com/content/animals/kidscorner/classification/kc_class_again.htm
Watch it:
Log on to www.mackinvia.com to access BrainPop. Watch the Invertebrates video and the Vertebrates videos. If you have time, play the quiz.