Because some elements present in the body are at such low levels they fall below detection limits. Typical instrumentation has limits to what concentrations they can detect.
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i dont know if you said the question right but 100 percent of 63 is 63
47 percent out of 100 percent is 47 percent (0.47 x 100 percent = 47 percent). More clearly, 47 % / 100 % = 47 / 100 = 0.47
3 percent out of 100 percent = 0.03 x 100 percent = 3 percent
25 percent of 100 percent = 0.25
Percent means out of 100 so 93 out of 100 as a percent is 93%