I think it's chapter's 4-5
Answer:
Scientists have often wondered what bellybutton lint is made up of. An Austrain chemist named Georg Steinhauser decided to find out, and since he had a belly button, he searched himself! He examined over 500 pieces to see what the lint has occupied. He found that it has cotton from clothes, AND dead skin, sweat, basically the stuff our body resists and extracts. Goerg Steinhauser found all this out within a teeny tiny part of your stomach.
Explanation:
Answer:
Have not
Explanation:
Have not combines to become haven't. For example, I have not ate food today you can also say I haven't ate food today.