The answer is a because if you look at the bone structure in each animal, you would notice how similar they look to one another, and all of the animals above use their legs for the same function which is walking which can suggest that all had a common ancestor.
hopefully this helps
Answer:
Explanation:
64 and 15 and they add 43 and 25
Hollow bones are always a disadvantage because it means that they are less sturdy and easier for predators to break.
