Name two features found in birds and their role in ensuring the ability to fly

There two features which facilitates bird to fly are presence of light and smooth feathers and light bones.

Explanation:

Birds are the only living creatures which has the ability to migrate from one place to another through flying. There are many physical features present in their body which facilitates them in flying.

Among the two features and their role in flying are as follows:  

Light and smooth feathers: Wings are the organ which is involved in flying. It is composed of feathers which are very colorful and are light in weight and smooth in its appearance. This apart from reducing the body weight helps the bird to reduce the force and drag during flying. Light bones: The skeletal system of the birds is composed of light bone which are primarily hollow with air sacs. This accounts for less body weight while flying.

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Atp is is our little "pocket" of energy. of course, if you have too little, then it means you have too little energy, and you'll pass out. the way to not have enough, is to have no energy sources (glucose, fats, proteins). you can't have too many atp molecules. cycles like the krebs cycle produce it, but if you have too much of any substrate (or too little for that matter), the cycle stops and atp is no longer made (it stops until substrate levels are such that the process can go on). in any case, this is unlikely since atp is constantly hydrolyzed and remade, even while you're asleep. you won't have too much. if you have zero, you are dead or dying.