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What allows reactions to take place to take place at a normal body temperature?
A Enzymes add additional energy to chemical reactions.
B Carbohydrates provide additional energy for body cells.
C Lipids store extra energy that can be used in reactions.
D. Enzymes reduce activation energy required for reactions.

Answer :

i will use respiration as an example. (Respiration is a chemical reaction which happens in every living thing.) 
You breathe in oxygen which is pumped round the body (by the heart) via the bloodstream. you then breathe out the carbon dioxide. the products are: 
GLUCOSE + OXYGEN --> CARBON DIOXIDE + WATER + ENERGY. 

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