The growth model shows an S-shaped curve because the population is limited by the carrying capacity. The growth model shows a J-shaped curve because the population isn’t limited by resources. Zero population growth occurs when the rate is equal to the birth rate. Once a population reaches the carrying capacity, the population will . Match the term on the left with its definition on the right. Term Definition 5. Emigration a. The number of organisms entering the population in an area 6. Immigration b. The maximum number of individuals of a species that an environment can support 7. Carrying capacity c. The number of organisms leaving the population in an area