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Currently, the extinction rate is conservatively estimated to be about one species per day and seems to be accelerating. Which of the following factors does not contribute to the increasing extinction rate?

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CHOOSE THE BEST ANSWER

Currently, the extinction rate is conservatively estimated to be about one species per day and seems to be accelerating. Which of the following factors does not contribute to the increasing extinction rate?

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Question restated: CHOOSE THE BEST ANSWER. Currently, the extinction rate is conservatively estimated to be about one species per day and seems to be accelerating. Which of the following factors does not contribute to the increasing extinction rate?

Option 1: Invasive species. Invasive species are known to disrupt native ecosystems by predation, competition, and disease transmission, often leading to declines or local extinctions of native species. This is a well-established driver of increased extinction risk, so this option is a contributor, not the correct choice.

Option 2: Unregulated commercial fishing. Overharvesting and destructive fishing practices can wipe out populations, alter food webs, and cause cascading declines, directly contributing to higher extinction risk for target and non-target species alike. This option also clearly contributes to increasing extinction rates.

Option 3: Fossil fuel use. Burning fossil fuels raises atmospheric CO2 levels, driving climate change. Climate change alters habitats, weather patterns, and species interactions, increasing extinction risks for many organisms. This is a recognized contributor to rising extinction rates.

Option 4: Deforestation. Removing forest cover destroys habitat, reduces biodiversity, fragments populations, and removes resources essential for survival. Deforestation is a major contributor to species declines and extinctions in many regions.

Option 5: The nitrogen cycle. Disruptions to the nitrogen cycle—such as excessive nutrient runoff leading to eutrophication or fertilizer-induced imbalances—can affect ecosystem health, but among the listed factors, it is less directly tied to the accelerating, widespread extinction rate compared to habitat destruction, overexploitation, and climate change. While nitrogen-cycle perturbations can stress ecosystems, they are not typically cited as a primary, direct driver of the current rate of species extinctions in the same way as invasive species, unregulated fishing, fossil-fuel–driven climate change, or deforestation.

In summary, the first four options describe well-established direct pressures that reduce populations and increase extinction risk; the nitrogen cycle, while ecologically important, is the least direct driver in this set and does not contribute as clearly to the accelerating extinction rate as the others.

BIOL 1001 (001-013) Exam 4: Unit 4

CHOOSE THE BEST ANSWER Currently, the extinction rate is conservatively estimated to be about one species per day and seems to be accelerating. Which of the following factors does not contribute to the increasing extinction rate?

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