Animals: Paper Bag Animals

Thansk to Nancy E.-B. for sharing iwth us this idea with us during the 2007 Maitland Simmons Institute.  I love the way your mind works!

Use paper lunch bags to model the simplest of animals:

Sponge: a plain bag

It has an inside and an outside and it just sits there. 

Cnidarian: a bag with the top cut into fringes

Flatworm: a flat bag, stapled/taped shut, with a straw stuck into it in one spot

One opening, through which both food enters and waste leaves. 

Nematod/Roundworm: a flat bag, stapled/taped shut, with a straw passing through in two spots

Separate spots for food to enter and waste to leave.