a frog is a kind of amphibian & amphibians lay eggs ->  frogs lay eggs  reproduction only occurs during adulthood & an example of reproduction is laying eggs ->  laying eggs only occurs during adulthood  frogs lay eggs & laying eggs only occurs during adulthood ->  frogs only lay eggs during adulthood  frogs only lay eggs during adulthood & adulthood is a stage in the life cycle process -> frogs only lay eggs during the adult stage of the life cycle process