Well, the good you consume is turned into calories, and as you move, it turns you use it. This is kinetic energy, your body produces its own heat. When you move, your muscles use kinetic energetic to make heat. Useful?
Answer:
hope this helps you out good luck
Answer:
So they are lighter and move quicker.
Explanation:
With the small wings and bodies birds have it would be hard for them to escape predators and lift their own weights if their bones were dense like humans' bones. The hollow part of the birds' bone is connected to their lungs so they have enough oxygen to fly easily. Hope this can help you! :)
