Explain how the structure of the frog's posterior appendages is related to their function.?

Question

Explain how the structure of the frog's posterior appendages is related to their function.?

Answer 1

Well a frogs back legs have a lot of potential energy. Like a coiled spring really. Its legs are designed to use as little energy as possible. Like pushing yourself away from a wall while in a swimming pool, that takes less energy and is more efficient then simply swimming  

Answer 2

I guess, posterior appendages are more muscular and longer and they help the frog to hop.