Carbohydrates are your main sources of energy. They are needed for operation of the brain, body, and inner organs.
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When an object reflects all light, you will see white light.
I think the parietal cells have canaliculi which secretes it
D. chemical bonds between reactants.
In a chemical reaction, the reactants break and establish new bonds between atoms by exchanging electrons. The overall atomic mass doesn't change. Element identities only change with a loss or gain of protons, which happen in nuclear reactions. The total number of electrons does not change, just become exchanged or shared between atoms.