The respiratory system is responsible for the exchange of oxygen with what gas? nitrogen hydrogen water vapor carbon dioxide

The correct answer is Carbon Dioxide (fourth option).

I hope that helps! c:

Polyethylene is a strong synthetic polymer that can be used to make toys and bottles. polyethylene is a plastic material called thermoplastic. one very useful property of thermoplastic is that when it is heated it turns into liquid, which can be molded into desired shape and size. also the material do not dissolve at room temperature.

I'd say your answer would be the sides of a metal pan become hot when the pan is placed on the stove burner