Answer:
Osteoblasts
Explanation:
Cells that secrete protein fibres in bones are called osteoblasts.
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Explanation:
As we are not able see the exchange of atoms that takes place during a chemical reaction, we look for physical changes that takes place at that time. A change in color and temperature, formation of a precipitate and emission of light and gas are some of the visible changes that assures that a reaction has taken place.
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