What environmental adaptation allows snakes to thrive in various habitats?

The ability of snakes to thrive in various habitats is largely due to their cold-blooded nature, which allows them to adapt to different environmental conditions. Being ectothermic, or cold-blooded, means that snakes rely on external heat sources to regulate their body temperature. This adaptation enables them to inhabit a wide range of environments, from deserts to forests and wetlands, as they can effectively manage their body temperature by basking in the sun or seeking shade as necessary.

In contrast, the other options present biological traits that are not applicable to snakes. Snakes do not have the ability to fly or webbed feet, which would not assist in their adaptation to diverse habitats. While some reptiles can change color for camouflage or thermoregulation, snakes generally do not exhibit significant color-changing abilities. Thus, the cold-blooded nature of snakes is a fundamental adaptation that aids their survival and success across various ecosystems.