K-selected species, with slow growth, low fecundity, and high care, are vulnerable to disruption as they replace losses slowly in stable habitats. r-selected species recover quickly from disturbances. The bird's one egg and long care indicate K-selection, making habitat disruption harmful due to slow population rebound. This explains prioritization for protection, as K-traits limit rapid recovery. Conservation must focus on maintaining stable nesting sites.

r-selected species in temporary habitats show rapid recolonization after crashes due to high fecundity and quick hatching. K-selected are stable. The crustacean's many quick-hatching eggs predict population crashes on drying but fast recovery on refilling, via r-traits. This response suits unpredictable pool durations. It highlights r-adaptation to frequent disturbances.

r-selected species with short lifespans, many offspring, and no care are resilient to disturbances and unpredictable conditions. K-selected species with long lifespans, few offspring, and care are vulnerable to frequent extremes, as recovery is slow. The shift to extreme events would favor EE's r-selected traits, making it more common. FF's K-traits would disadvantage it in instability. r/K selection applies broadly, not just to plants. Option B predicts the likely outcome.

r-selected species have high intrinsic growth rates (r), early maturity, and many offspring, evolved for disturbed habitats with high, unpredictable mortality. K-selected species have lower r, later maturity, and fewer offspring, for stable environments near K. Species CC's traits indicate r-selection, best suited to frequently disturbed habitats where rapid reproduction exploits opportunities. Stable habitats would favor K-traits like long lifespans. Parental care isn't required here, as quantity compensates for mortality. Option B identifies the selecting environment.

K-selected traits evolve under competition near carrying capacity in stable environments, favoring efficient resource use and high offspring survival. r-selection responds to disturbance with rapid reproduction. The herbivore's long gestation, single offspring, and care suggest K-selection shaped by resource competition in the stable savanna. This limiting factor selects for investments that enhance survival amid density-dependent pressures. It explains why such traits persist where predictability allows competition to dominate.

r-selected traits like early reproduction and large litters are favored in disturbed, high-mortality environments to maximize survivors. K-selected traits, such as delayed maturity and fewer offspring, suit stable, competitive habitats. The mowed patch's frequent disturbances would select for more r-selected traits in rabbits, like higher litter sizes, to counter mortality. In the stable meadow, moderate traits persist due to lower disturbance. Genetics can allow shifts over time via natural selection. Option A correctly predicts the divergence.

In K-selection, species invest in traits like long lifespans, delayed maturity, few offspring, and high parental care to succeed in stable, resource-limited environments near carrying capacity. r-selected species prioritize rapid reproduction, many small offspring, and little care for unpredictable habitats. Species M's slow maturity, few offspring, and territorial defense suggest K-selection, fitting the stable island with limited food where competition is key. Compared to r-selected species, a long lifespan and high investment per offspring would be expected, as these enhance competitive ability and survival rates in density-dependent conditions. This trade-off allows K-selected species to maximize fitness when resources are consistently scarce but predictable.

K-selection favors traits like few offspring, extensive parental care, and long lifespans in stable, competitive environments near carrying capacity, while r-selection promotes many offspring, quick maturity, and short lifespans in disturbed, unpredictable settings. Species A exhibits r-selected traits, thriving after disturbances like floods, whereas Species B shows K-selected characteristics, dominating in undisturbed habitats. Stabilizing the river with a dam reduces disturbances, creating a more predictable environment that favors K-selected species like B, which can outcompete others through superior resource use and offspring investment. Over time, this shift would lead to an increase in Species B as competitive pressures near K limit r-selected species. The change highlights how environmental stability selects for K-traits that enhance survival in density-dependent conditions.

Life histories exist on an r-K continuum, with intermediates blending traits for moderately variable environments. Strict r or K applies to extremes. Species U's 10 offspring, moderate care, 5-year lifespan, and variable environment suggest an intermediate position, reflecting both disturbance adaptation and some competition. This best describes it as environments aren't purely unstable or stable. The continuum allows nuanced classification beyond binaries.

K-selected species exhibit traits optimized for stable environments with high competition near carrying capacity: long lifespan, delayed reproduction, few offspring, and extensive parental care. R-selected species show opposite traits suited for unstable environments: short lifespan, early reproduction, many offspring, and minimal parental care. This cliff-nesting bird displays classic K-selected traits: laying only 1-2 eggs annually, both parents providing extended care for months, and individuals living over 20 years in an environment with consistent food supply and climate. The key advantage of K-selection in stable environments is that heavy investment in few offspring ensures high juvenile survival rates when competition for resources is intense. By feeding chicks for months, both parents ensure their offspring develop the size, strength, and skills needed to compete successfully in a crowded, stable environment. Option B correctly identifies this as K-selected and explains the advantage as higher survival of few offspring in a stable environment with competition for resources.