Write the Word or Phrase That Best Completes Each Statement $y = \frac { c } { 1 + a e ^ { - b t } }$

Short Answer

Write the word or phrase that best completes each statement or answers the question.
Provide the missing information.
-A function defined by $y = \frac { c } { 1 + a e ^ { - b t } }$ is called aــــــــــــ growth model and imposes a limiting value on $y$ .