Response:
.
Step-by-step explanation:
It is established that the surface area S of a single-celled organism can be calculated by multiplying 4π by the square of the cell's radius r.
We need to portray S as a function of r.
Let r represent the radius of the cell and S(r) denote the surface area of the single-celled organism corresponding to radius r.
Based on the question,
Therefore, the required function is .