33. Which of the following explains how the expansion of ranching has affected the environment in South America?
Answer: D
The clearing of the rain forest to create pastureland for cattle is reducing habitats for native species.
The expansion of ranching in South America has significantly impacted the environment, particularly through the clearing of rainforests to create pastureland for cattle. This practice has led to a reduction in habitats for various native species, contributing to biodiversity loss.
A) The building of dams to create reservoirs of drinking water for cattle has flooded valleys and destroyed habitats.
While the construction of dams can indeed lead to habitat destruction, this option does not directly relate to the primary environmental impact of ranching expansion in South America. The focus here is on the clearing of land rather than the flooding caused by dams.
B) The irrigating of pastureland for cattle has reduced the amount of water available for wildlife.
This statement addresses water resource issues but does not capture the broader and more direct impact of ranching expansion, which is the clearing of forests. While irrigation can affect water availability, it is not the most significant environmental consequence of ranching in this context.
C) The overgrazing of cattle in the region has helped increase the fertility of the soil for growing crops.
This option inaccurately suggests a positive effect of overgrazing, which typically leads to soil degradation rather than increased fertility. Overgrazing is detrimental to land health and does not align with the environmental consequences of ranching expansion.
D) The clearing of the rain forest to create pastureland for cattle is reducing habitats for native species.
This option correctly identifies a major environmental issue associated with ranching in South America. The deforestation resulting from the need for more pastureland directly threatens native species, reducing biodiversity and disrupting ecosystems.
Conclusion
Option D is definitively correct as it highlights the critical issue of habitat loss due to deforestation for cattle ranching, which poses a significant threat to biodiversity in South America. Other options fail to address the primary environmental impact of ranching or present inaccuracies about the consequences of these practices. Thus, the core concept of habitat destruction due to ranching expansion is best represented by this choice.