Which type of objects require detailed descriptions for identification due to lack of unique features?

The correct choice highlights that certain types of objects are termed "featureless," meaning they do not possess distinctive characteristics that would typically aid in their identification. Because these objects lack unique features, it becomes essential to provide detailed descriptions to facilitate their proper identification. This may include information such as size, shape, color, material, and other descriptive elements that can help distinguish one featureless object from another.

In contrast, unfixed, fixed, and temporary objects generally have traits or alterations that allow for easier identification. Fixed objects are usually stationary and can be associated with specific locations or conditions, while unfixed objects may have features that are identifiable through varying contexts. Temporary objects might also have identifiable characteristics during their brief existence or state. Thus, it is the featureless classification that necessitates a more comprehensive description to overcome the challenge posed by their lack of inherent distinctive attributes.