Which of the units listed below are smaller than a gram? Select all that apply.
ug
ng
mg
kg

Answer:
µg
ng
mg
Explanation:
1 kilogram(kg) =1 000 g
1 gram(g) =1 g
1 milligram(mg)=0.001 g
1 microgram(µg)=0.000 001 g
1 nanogram(ng)=0.000 000 001 g