Which of the following is a characteristic of normal, healthy nails?

Normal, healthy nails indeed come in a variety of shapes and sizes, which is a natural characteristic influenced by genetics, age, and overall health. Healthy nails can be oval, square, or even rounded, showcasing personal preference and individual anatomy rather than conforming to a single standard shape. This diversity reflects the unique biological makeup of individuals, as well as their lifestyle choices and habits.

In contrast, nails that are too long may be prone to breakage and other issues, while nails that are limited to a specific shape, such as always being square, do not represent the full range of nail types found in the population. Lacking color is not a characteristic of healthy nails; they should typically have a healthy pink hue at the nail bed, indicating good circulation and overall health. Thus, the variety in nail shapes is an important hallmark of normal, healthy nails.