What is a common feature of thermoplastics?

Thermoplastics are known for their ability to be reshaped upon heating, allowing them to be reformed and reused without significant deterioration in their physical properties. This characteristic is particularly useful in various applications, where materials can be remolded into different shapes or products as needed. The molecular structure of thermoplastics enables them to soften when heated and solidify upon cooling, making them highly versatile for manufacturing processes such as injection molding and extrusion.

The other options do not accurately describe the properties of thermoplastics. While thermoplastics can become brittle under certain conditions, they are not inherently brittle. Additionally, they can indeed be reshaped and reused multiple times, which contradicts any notion that they cannot be reshaped. Lastly, thermoplastics do not degrade rapidly; instead, they can be quite stable, although their properties can be affected by exposure to extreme temperatures or certain chemicals over time.