Where is the choices????????????????
Vaccination has been one of the most successful developments of medical science because for centuries it has been proven effective in diminishing the number of people at risk on certain kinds of diseases. How does vaccination help? Vaccines are contained weakened organisms that are injected to the body. This then boosts the immune system as they release a certain type of cells to combat with the foreign organisms. When the person is exposed to the same organisms again, he/she will develop immunity.
Answer:
Vitamin B3 ( niacin ) and D
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Likely the chronological age, mainly because it would explain the differences in puberty stages between the two boys, which is an example of physical maturation.
It is found in the bones <span>such as hip bone, breast bone, </span>skull<span>, ribs, </span>vertebrae<span> and shoulder blades, and in the cancellous ("spongy") material at the proximal ends of the long bones </span>femur<span> and </span>humerus<span>. </span>
