25. A certain sand-dune landscape is composed of two habitat types: semistabilized (SM) sand habitat and stabilized (ST) sand habitat. A researcher has observed that Gerbillus pyramidum (GP) mainly occurs in the SM habitat and G. allenbyi (GA) mainly occurs in the ST habitat. Axis of environmental heterogeneity is

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Answer:

The correct answer to the following question is "Heterogeneity in disturbance regime".

Explanation:

  • Environmental heterogeneity seems to be a standard occurrence of natural environments and therefore is intended to improve species diversity by enabling separation of niches and coexistence of species.
  • When this issue concerns settled and unstable ecosystems, it thus refers to various degrees or levels  of disruption throughout the two habitats. The problem is not about variability in environmental influences, as well as food resource quality.

So that the above is the right answer.