| $S$-shaped growth curve (Sigmoid) | $J$-shaped growth curve |
| $(1)$ It consists of $5$ phases: lag phase,positive acceleration phase,exponential phase,negative acceleration phase,and stationary phase. | $(1)$ It consists of $2$ phases: lag phase and exponential phase. |
| $(2)$ Finally,the population reaches a steady state where the growth rate becomes zero because the birth rate equals the death rate. | $(2)$ Finally,the population crashes due to a rapid increase in mortality rate or resource exhaustion. |
| $(3)$ Example: Yeast cells in a culture medium. | $(3)$ Example: Reindeers,algal blooms,or lemmings in the Tundra. |
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