The new substances that are formed during a chemical reaction are called the products. The original substances are called the reactants. For example, when hydrogen gas is added to oxygen gas and ignited, the new substance water is formed. The reactants are hydrogen and oxygen.
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A. Lungs are strenghtened through cardiovascular exercise.
Answer:
Below
Explanation:
They are important because they can help up get warmer/colder when our bodies can't
