Answer:
Left
Explanation:
To convert from Nanograms to centigrams, you have to move the decimal to the left hand side.
1 nanograms = 1 x 10⁻⁹g
1 centigrams = 1 x 10⁻² g
So to convert from nanograms to centigrams,
Multiply by 1 x 10⁻⁷ or move 7 places to the left
