Answer:
Europa
Explanation:
There are 4 Galilean moons and Europa is the smallest. Scientists believe that there is ocean below the sheet of ice.
Frogs do have lungs but they are small and rarely used, frogs mostly take in moisture through the skin in process called cutaneous gas exchange.
The answer is relative dating.
Banana peels can be decomposed by bacterial action, so they are biodegradable.
The correct answer would be spilled diesel fuel