Amphibians are the first true tetrapods, or vertebrates with four limbs, and ancathostega is one of the earliest tetrapods found, and by far the most complete. Given these facts, what do ancathostega have four of among the following options:
- Eggs
 - feet
 - Wings
 - alveoli
 - Lungs
 - ovaries
 - rings
 - Limbs


 

        Limbs 