Get your students to figure out the characteristics of life all by themselves.
Stations with a variety of objects will gets students trying to figure out the "Big 7".
They will have a great time playing with the objects and brainstorming the "Big 7".
I've included the components for each station as well as a "ballot" for your students to fill in. Additionally, I've included a couple of follow up ideas to help students apply the characteristics in context.