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Detailed explanation-1: -(iv) Non-Ecological Models: As the name suggests this model is the opposite of ecological model. Whereas the ecological model accepts that the environment is complex and changes keep on taking place, the non-ecological models assume stability in the environment and that everything will remain the same.

Detailed explanation-2: -Stability has two components: Resistance-the ability of the ecosystem to continue to function without change when stressed by disturbance. Resilience-the ability of the ecosystem to recover after disturbance.

Detailed explanation-3: -Stability of environmental systems is essentially a concept that acknowledges, responds to change, or lacks change in the systems involved. Discussion must therefore incorporate ideas of equilibrium, and of how, or by what mechanism, an average condition or equilibrium is maintained (White et al., 1984, p.

Detailed explanation-4: -Greater biodiversity in ecosystems, species, and individuals leads to greater stability. For example, species with high genetic diversity and many populations that are adapted to a wide variety of conditions are more likely to be able to weather disturbances, disease, and climate change.