Final answer:
Exponential growth occurs when resources are unlimited, resulting in a J-shaped curve. When resources become scarce, logistic growth begins, and the growth pattern levels off to form an S-shaped curve.
Step-by-step explanation:
The growth model that occurs when the amount of available resources is not limiting is exponential growth. Under exponential growth, the population can grow without bounds, which is visually represented by a J-shaped curve. This curve shows that the population grows slowly at first, but its growth rate dramatically increases as the population size grows larger. When resources become scarce, however, the growth model that comes into effect is logistic growth, wherein population expansion slows down and levels off as it approaches the carrying capacity of the environment, resulting in an S-shaped curve.