Question: Select all of the following characteristics that define most amphibians. Check All That Apply Ectothermic Ectothermic Covered in hard keratinized scales Covered in hard keratinized scales Have jointed appendages for movement Have jointed appendages for movement Produce sound through their larynx Produce sound through their larynx Are incapable of hearing due to their small brains Are incapable of hearing due to their small brains Some undergo metamorphosis Some undergo metamorphosis Thought to have evolved into birds Thought to have evolved into birds Have three-chambered hearts Have three-chambered hearts Respire through their skin or small lungs Respire through their skin or small lungs Have eyelids to keep eyes moist Have eyelids to keep eyes moist Spend some part of their life cycle in water Spend some part of their life cycle in water Evolved from lobe-finned fishes. Need Assignment Help?