Using what students currently know about their body, they decide who would “win” in a battle to find out which body system is “most important”. Complete each battle by justifying the answer using as much scientific evidence as you can to defend decisions.
I use this activity in the beginning of my Homeostasis & Interacting Systems unit. It makes students activate prior knowledge about their bodies as well as use reasoning & justifying skills. I will also go back to this activity toward the end of the unit, and ask/discuss if their answers have changed after learning more about the systems.
I have found that my students love & hate this activity at the same time, as there is no one correct answer. The greater their background is in the systems, the greater the challenge to choose a “winner” each round. Many of them were surprised by their final winner, as it was not what they thought it was going to be when they began thinking about which is “most important”.