Final answer:
The scale of the illustration is 5.56 x 10^(-2).
Step-by-step explanation:
The scale of the illustration can be determined by comparing the length of the illustration to the actual average length of the protozoan. The average length of the protozoan is given as 1.1x10-4 m. The length of the illustration is 5.56 cm, which is equivalent to 5.56x10-2 m. Therefore, the scale of the illustration is C. 5.56 x 10-2.