Which of the following best describes polymers?

Polymers are large molecules made up of repeating structural units, typically connected by covalent chemical bonds. The defining characteristic of polymers is their ability to be molded into various shapes when heat and pressure are applied. This property allows for a wide range of applications in industries such as manufacturing, construction, and consumer products, making them highly versatile materials.

When under pressure and at elevated temperatures, many polymers can undergo a process called plastic deformation, which enables them to be shaped into different forms, such as bottles, containers, and various other items. This is a fundamental property that differentiates them from other types of materials, allowing for creative designs and functionality.

In contrast, natural resources refer to materials sourced from the environment; metals are specific elements with high conductivity and strength; and compounds that break down easily typically describe biodegradable materials, which do not represent the general behavior or characteristics of polymers. Thus, the statement accurately captures a key aspect of polymers, emphasizing their capacity to be molded and reshaped under specific conditions.