What is a key feature of amphibians?

A key feature of amphibians is that they typically reproduce in water. This characteristic is vital for their life cycle, as amphibians, such as frogs and salamanders, generally lay their eggs in aquatic environments. The eggs hatch into larvae that also live in water and undergo metamorphosis to develop into adult forms. This life strategy is tied to their evolutionary adaptations and the need for moisture, which is essential for the survival of their eggs and young.

The other features mentioned do not accurately represent amphibians; for example, they are not exclusively terrestrial, as they depend on aquatic environments for reproduction. Amphibians are also cold-blooded rather than warm-blooded, and they do not have scales; instead, their skin is moist and permeable, which helps them in respiration and staying hydrated. This understanding of amphibians is crucial for appreciating their role in ecosystems and their vulnerability to environmental changes.