As part of their new science curriculum, eFantasmic has its new Biodiversity unit free for all right now. I am not sure how long this is going to last, so I want all my online friends to get there now so they can download all the components. This is a good unit for all grades. For early grades stick to the easier living vs nonliving, for upper grades, have them do all components and then go into further detail. You can find this resource here http://www.efantasmicms.com/members/efantasmic/adminpages/UNIT01

Have fun!