No caffein,there is a factor that must not be changed when conducting an experiment,known as controlled variable
The answer to your question is


Enzymes help break down carbohydrates, fats, and proteins.
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Answer:
atmospheric nitrogen converted into early water vapor which was later pressurized into liquid
A contusion occurs when a strong blow or repeated blows from an object struck the body, crushing the underlying muscle fibres and connective tissues without breaking the skin.
A contusion can vary in severity depending on the object and location of the injury. For example a contusion to the brain may cause a concussion that can cause serious symptoms that require immediate medical attention