Question

Picture attached please help

Answer 1

Answer:

D

Step-by-step explanation:

red blood cell = 0.000009 = 9 × $10^{-5}$

cold virus = 0.0000003 = 3 × $10^{-7}$

Divide diameter of red blood cell by diameter of cold virus

$\frac{9(10^-5)}{3(10^-7 )}$

= 3 × $10^{-5-(-7)}$

= 3 $10^{-5+7}$

= 3 × 10² → D