Weight bearing activities build better bones because bone cells respond by creating more bone tissue. The more the bone tissues are the stronger it builds up. This bone-building process is also called as osteogenesis. Only the bones involved on the exercise can generate new bone tissue so, it is really better to have a weight exercise that involves almost all of the bones.
Answer:
No. She is not correct.
Explanation:
A chemical reaction alters the distribution or arrangement of the atoms. However, there is no loss of atom because according to the Law of Conversion of Mass, Matter can neither be created nor destroyed.
For example, the makeup of water is two molecules of Hydrogen and One Molecule of Oxygen (that is 
O). It can change states and still retain its composition (that is, the same number of atoms) however if it comes in contact with Sodium metal (Na), the atoms become re-arranged and new substances are formed. The two substances that are formed are:
- molecular Hydrogen (H2) and
- Sodium hydroxide (NaOH).
When this happens, we know that a chemical reaction has happened.
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