What physical characteristics are common in poisonous snakes in Tennessee?

In Tennessee, common characteristics of poisonous snakes include having an elliptical pupil and a distinct pit located between the nostril and the eye. These features are indicative of the pit viper family, which includes species such as copperheads and rattlesnakes. The elliptical pupil aids in better vision in varying light conditions, and the heat-sensing pit allows these snakes to detect warm-blooded prey even in the dark. Recognizing these physical traits is crucial for correctly identifying poisonous snakes and ensuring safety in environments where they may be present.

Other options present characteristics that do not align with what is commonly found in poisonous snakes in Tennessee. For instance, colorful scales and long bodies could describe a variety of non-poisonous snakes as well, while thin elongated bodies and round pupils are traits more typical of non-venomous species. Additionally, while large fangs are indeed a feature of some venomous snakes, bright coloration is not a reliable indicator of venomous snakes in Tennessee; in fact, many harmless snakes also possess vibrant colors. Thus, option A specifically highlights key traits associated with Tennessee's poisonous snakes.