What are two other things the students should look at before evaluating which container is better for the environment

Biodegradability and what chemicals are produced when it is broken down. 

Aneutral atom must have the same number of neutrons and protons? no, they must have the same number of protons and electrons

Iwould say overuse ( but not 100% sure ) in the u.s. we tend to overuse water by leaving it running, throwing it away, taking long showers, etc.