Last updated April 11, 2019 at 2:08 pm
What happens inside your body when you breathe? What makes the air move in and out of your lungs?
What you’ll need:
1 x pair of scissors
2 x balloons
1 x drinking straw
1 x elastic/rubber band
1 x pencil
1 x ball of plasticine
1 x 600 ml plastic PET bottle