| A | B |
|---|
| adaptive radiation | the process of evolution that produces many species from an ancestral species |
| tetrapod | four footed animal with legs that have feet and toes that have joints |
| metamorphosis | a series of developmental changes in the form or structure of an organism |
| cloaca | a chamber that receives the digestive wastes, urinary waste, and eggs or sperm before they leave the body |
| nictitating membrane | a transparent eyelid that can move across the eye to protect it underwater and keep it from drying out on land |
| tympanic membrane | eardrum |
| ectotherm | animals that obtain their body heat from the external environment |
| tympanic membranes | eardrums |
