The skeletal system relates to the structure & support of organisms; made of salts and proteins which are found in vertebrate animals and also protects internal organs
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I believe the answer is :
Oxygen, Nitrogen, and Fluorine because they are highly electronegative and very small.
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<span>The thymus.The thymus plays an important role in the development of T-lymphocytes which is an important type of white blood cell. It reaches maximum development at puberty and then the thymus begins to get atrophied (the shrinking of the thymus with age) and then the thymic stroma is replaced by fat tissue. Loss of thymic function is thought to contribute to weaker immune system of the elderly, increasing instances of diseases such as cancers and other infections.</span>
D is the correct answer to this question. Here is a chart of energy transfer.
