Answer:
Oxygen
Explanation:
When a human breathes in they take in oxygen which they use to stay alive and keep the heart beating when you breathe out you release carbon dioxide. Oxygen is used for cellular respiration which heals you.
the bottom because layers get added as time goes on so whatevers on the bottom is the oldest
Answer:
2 mine take 80 man to drive across a mass drive to get a car in his car or something right now
Sunlight spectrum or prism refract light and create a rainbow (roy g biv) Red Orange Yellow Green Blue Indigo and Violet.