The answer is iron. Research has shown an increase in serum iron concentreation in athletes and a concomitant decrease in magnesium ions. The increase in iron concentration is thought to be attributed to tissue injury from the strenuous physical activity. The decrease in magnesium is due to demand by the skeletal muscles.
<span>B. Chromosomal disease results from an uncontrollable growth of abnormal cells.</span>
Because we can’t tunnel down, so in order to study the interior layers, we must use indirect methods.
The answer that i'd go with is A.Sunlight
Hope i helped
