Question

most plastic bags are made of polyethylene. polyethylene is a kind of polymer, a substance made of hundreds of repeating units called monomers. the prefix poly - in polyethylene means many. so polyethylene is made of many units of ethylene. which model shows polyethylene?

Explanation:

Polyethylene is a polymer, which means it is made of many repeating units (monomers). The first model shows ethylene (a monomer), while the second model shows a chain of repeating ethylene units, which is characteristic of polyethylene.

Answer:

The second model shows polyethylene.