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  1. The value of r can be positive, meaning the population is increasing in size (the rate of change is positive); or negative, meaning the population is decreasing in size; or zero, in which case the population size is unchanging, a condition known as zero population growth.

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    K and r are two extremes for a range of population growth strategies, no one strategy is better or best. Identify the characteristics associated with K selected and r selected species. Volunteer here: Created by Khan Academy.

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  3. When the per capita rate of increase ( r ) takes the same positive value regardless of the population size, then we get exponential growth. When the per capita rate of increase ( r ) decreases as the population increases towards a maximum limit, then we get logistic growth.

  4. Student Objectives Explain what a population is in ecology. Describe what r, K, and N 0 are in a population. Analyze how r, K, and N 0 can change population sizes over time both individually and together.

  5. Population growth is the increase in the number of people in a population or dispersed group. Actual global human population growth amounts to around 83 million annually, or 1.1% per year. [2] The global population has grown from 1 billion in 1800 to 7.9 billion in 2020. [3]

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