Density independent limiting factors are factors that

• A. Affects population no matter the size
• B. Affects populations depending on resource availability
• C. Depends on population density
• D. Changes in resource supply with time

Answer: (A)

Density-independent limiting factors are events or conditions that limit a population regardless of how many individuals are present. This means a flood, wildfire, hurricane, or severe drought can reduce or eliminate individuals equally whether there are few or many in the area. The impact does not scale with population size, so the same event can affect populations of different densities in similar ways. That’s why the correct idea is that these factors affect a population no matter the size. In contrast, many limiting factors depend on how crowded the population is—competition for food, disease spread in dense groups, or increased predation with higher density—so those are density-dependent. Changes in resource supply over time can interact with population size in ways that aren’t inherently density-independent, which is why they don’t define this concept.