The+breathing+system+7

OBSERVE: Pull down slowly on the stretched balloon. What happens to the balloon inside the cup? The balloon inside infates

Push up on the stretched balloon. What happens inside the .cup? The balloon inside defates

EVALUATE: Is there more or less space inside the cup when you pull down on the large balloon? More

IDENTIFY: When you pull the large balloon down, what fills the extra space in the cup? The balloon inside the cup.