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Trace elements are present in tiny amount, and only 0.2% mass of a human.
The present tense of trace is:I/You/We/They trace.He/She/It traces.The present participle is tracing.
A trace amount refers to a very small amount compared to the things that have been stated.
Trace
Trace
S. S. Marwah has written: 'The determination of aluminium at trace level in blood serum'
Of the 92 elements from hydrogen to uranium 90 of them are present in some amount in the crust of the earth. Trace amounts of plutonium and other transuranics are also present.
they are present in very small amounts
Because humans (and life in general) require a trace amount of it to survive.
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Trace
No. Nitric acid is only present in trace amounts in the atmosphere.