What makes up a can (please help me :D)?

Question

For my summer homework, I need to know what makes up a can (a normal can that you would find in a grocery store), a bike, and an air conditioner. ITS OKAY IF YOU DON'T LIST EVERYTHING, I just need a few for each.

Note: THIS IS NOT CHEATING, please don't tell me to find out for myself.

Thanks.

Answer 1

Iron or aluminum, usually lined with a plastic (petroleum - hydrogen, carbon and oxygen)