Explain why amphibians must return to the water reproduce?

Answer 1

Many amphibians, like the frog, reproduce in water as the new generation will spend its first few months a water animal. For instance, the frog lays an egg, which becomes a tadpole, breathing through gills. Were the amphibian not to return to water, any eggs that were fertilized would not survive.

Answer 2

amphibian eggs lack a hard shell so are in constant danger of dessication.