Question

the long side - by - side polymer chains in high - density polyethylene (hdpe) impact its properties. plastic bags made from hdpe are lightweight, flexible, and sturdy. they are waterproof and resistant to temperature extremes. hdpe is relatively inexpensive to make, so plastic bags are a low - cost way to transport foods and other goods. which properties of hdpe contribute to its use in plastic bags? select all that apply. it lets in water. it is sturdy. it is expensive to make. it is resistant to cold temperatures.

Explanation:

The text states that HDPE - made plastic bags are lightweight, flexible, sturdy, waterproof, resistant to temperature extremes, and relatively inexpensive to make. So we select properties that match this description.

Answer:

It is sturdy.
It is resistant to cold temperatures.