Practice question

The keyed exception is “Strong density-dependent mortality.” In the context of which of the following traits is not characteristic of r-selected tree species, that statement differs from the governing ecological pattern and must be evaluated against the mechanism rather than accepted from wording alone. Interpretation must distinguish absolute population change from a per-capita rate and must state the time interval and population boundary. Age structure, dispersal, environmental variation, and delayed responses can all make observed trajectories depart from a simple model. The remaining alternatives—“High colonization capability”, “Thrive in ephemeral habitats”, “Low resource competition”—refer to different states, processes, or scales and therefore do not express the same causal relationship. Mechanistic support comes from showing how resource limitation, enemies, mate availability, or physiological stress changes demographic performance. A descriptive association alone does not establish regulation or causation. The cited framing is therefore most useful when treated as a conditional biological claim, with assumptions about scale and environmental context kept explicit.