Every tiger has a different what pattern, making them unique like fingerprints?

The correct answer is related to the unique stripe pattern found on every tiger. Each tiger has a distinctive arrangement of stripes that serves as a form of identification, much like human fingerprints. This unique stripe pattern is crucial for their individual identification in the wild and helps researchers and conservationists track and study tiger populations.

The other options, while they describe characteristics of tigers, do not convey the same level of individual uniqueness. For example, the color of tigers can vary somewhat, but it does not serve as a unique marker. Similarly, while tigers do come in various sizes, size alone cannot distinguish one tiger from another in the way that stripes can. Spots are commonly associated with other wild cats, particularly leopards, rather than tigers, which are predominantly known for their stripes. Thus, the uniqueness of tiger stripes is the defining characteristic that makes them stand out, like fingerprints do for humans.