Final answer:
When a tadpole emerges from an egg, it undergoes development and goes through a series of changes as it grows into an adult frog with legs and lungs.
Step-by-step explanation:
When a tadpole emerges from an egg, it has a tail and gills. As it undergoes metamorphosis, the tadpole grows legs, loses its tail, and develops lungs, preparing it for life on land as an adult frog. This process is an example of development. Development refers to the series of changes an organism goes through as it grows and matures. In this case, the tadpole develops into an adult frog with legs and lungs.