Why are the life cycles of amphibians different from those of most vertebrates?

Amphibians have unique life cycles that typically include both aquatic and terrestrial stages, reflecting their dual life strategy. Most amphibians begin their life as eggs that hatch into larvae (like tadpoles), which are fully aquatic and undergo metamorphosis to develop into adult forms capable of living on land. This contrasts with many other vertebrates, which often have a more direct development that doesn't involve such drastic changes in habitat or form. The amphibian life cycle allows them to exploit different environments at various life stages, enhancing their adaptability.