As-shaped curve is called a(n)
a. logistic growth curve
b. exponential growth curve
c. linear growth curve
d. population growth curve

The answer is a. logistic growth curve. Sigmoidal curve or S-shaped curve is called a logistic growth curve. It reflects the functions that increase slowly at first, then more rapidly in the middle of the perion, and at the end, they increase slowly again until they reach a maximum value at some period of time.