One billion (10^9) micrograms = 1 kilogram
So 4630 micrograms = 4630/10^9 = 4.63*10^-6 kilograms.
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1,000,000 micrograms = 1 gram4,630 micrograms = 0.004630 gram
There are 1000mm per meter. So, 4630 mm = 4630/1000 = 4.63m
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If you've been specifically asked to, sure. But unless kilograms are really small, or the leaf is really big, grams or even micrograms, if possible, are best.
The question is incomplete since it does not specify the units for 15000. Are they micrograms, kilograms, tons, ounces, pounds, solar masses?