3. Amphibians show clear evolutionary changes as they adapted away from a strictly aquatic life to
a semi-terrestrial existence. Several key characteristics changed in order to enable them to make
this shift. Describe the changes that occurred in the following categories to support their venture
to life out of water:
Explain and diagram their "typical" tetrapod body plan and design
Respiratory system (include structures and process that maximize gas exchange)
Reproduction
Metamorphosis (include how metabolism plays a role in this process)