The law of conservation of energy is a law of science that states that energy cannot be created or destroyed, but only changed from one form into another or transferred from one object to another. Hope it helps
To make ATP, cells must join together ADP & a phosphate using energy from food. A phosphate is removed from an ATP molecule in order to provide energy for the cell. Thus, the ATP molecule turns into an ADP molecule. We eat food which gives us energy to add another phosphate group to the ADP molecule, turning it into an ATP molecule. The cycle then begins again.
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Lymph nodes swell to protect us from illness if they do not swell non fatal illnesses could spell out death
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Blood carries the oxygen through out the body and gets re-oxygenated to keep the body going.
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Sodium bicarbonate and digestive enzymes.