Answer:
mitchondria is powerhouse
1. Break down of Food into Energy 
Oxygen
2. Absorb X - Rays in Bones Calcium
3. Cell Membrane Function Sodium
4. All Organic Compounds Carbon
DNA is going to be the answer
Answer:
The digestive system!
Explanation:
The digestive system is made up of the digestive tract - a series of hollow organs joined in a long, twisting tube from the mouth to the anus - and other organs that help the body break down and absorb food.
Organs that make up the digestive tract are the mouth, esophagus, stomach, small intestine, large intestine - also called the colon - rectum, and anus.
That would be Dinitrogen sulfide i believe :)
Hope this helps :)
