The population density equation N t+1 = N t + [(B + I) - (D + E)] shows that density increases when which terms dominate?

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The population density equation N<sub>t+1</sub> = N<sub>t</sub> + [(B + I) - (D + E)] shows that density increases when which terms dominate?

Answer: Natality and immigration.

A Natality and immigration
B Mortality and emigration
C Death and immigration
D Emigration and natality

Correct answer: A. Natality and immigration

Explanation: Population size rises when births (B) and immigration (I) together exceed deaths (D) and emigration (E).

Exponential growth produces an ever-steepening J-curve with no limit, an unrealistic long-term model; logistic growth produces an S-curve that levels off at the carrying capacity K, as growth rate (K−N)/K shrinks to zero once resources are fully used.

Concept context

How organisms interact with abiotic factors and respond to stress, plus population attributes, growth models, and interspecific interactions such as predation, competition, and mutualism.

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The population density equation N<sub>t+1</sub> = N<sub>t</sub> + [(B + I) - (D + E)] shows that density increases when which terms dominate?

Concept context

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