Which of the following measurements has three significant figures?
01.02 x 10-3 g
o 0.089 g
100 g
o 7.8 x 10-6g

01.02 × 10⁻³g has 3 significant figures.

Explanation:

01.02 × 10⁻³g has 3 significant figures because all non-zero figures are significant, all zeros in between numbers are significant, and all zeros before or after (unless there is a decimal point before) are not significant.

air quality

poor drinking water

and heavy polution

can lead to poor health

the answer is na (sodium)