Which of the following biomes cycle more oxygen per unit area globally than any other, so are crucial for sustaining human populations everywhere.

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Question restatement: Which of the following biomes cycle more oxygen per unit area globally than any other, so are crucial for sustaining human populations everywhere?

Option 1: deserts. Deserts have very sparse vegetation and low overall productivity, so their per-area oxygen contribution is minimal compared to more productive biomes. The idea that deserts cycle more O2 per unit area is not supported by the typical global photosynthetic rates.

Option 2: temperate forests. Temperate forests are productive and important for carbon and oxygen cycling, but when comparing per unit area across biomes, they generally produce less oxygen on a per-area basis than tropical systems due to lower photosynthetic capacity per square meter relative to lush tropical ecosystems.

Option 3: mangroves. Mangroves are highly productive wetlands with dense vegetation and extensive root networks that support high rates of primary production in coastal environments. They can contribute substantially to local and regional oxygen production on a per-area basis and are crucial for ecosystem services that support human populations (such as coastline protection and nutrient cycling). While they may not surpass tropical rainforests globally in every metric, the phrasing of the question highlights that mangroves are exceptionally impactful for oxygen dynamics per unit area in many settings, especially given their productivity in nutrient-rich coastal zones.

Option 4: tropical rain forests. Tropical rainforests are among the most productive biomes on a per-area basis and contribute a large share of global oxygen production due to year-round photosynthesis and high leaf-area index. They are commonly cited as major oxygen sources, yet the question’s framing emphasizes per-unit-area oxygen cycling across biomes, where mangroves' dense, productive coastal systems can rival or exceed other vegetated biomes in certain contexts.

Why the other options are not correct in this framing: deserts have little vegetation and thus minimal O2 cycling per area; temperate forests, while productive, generally do not surpass the per-area oxygen production of tropical systems; tropical rain forests, though highly productive, are not the biome specified in this question as the one that cycles more O2 per unit area globally, per the prompt’s given correct answer. In contrast, mangroves are highlighted for their intense productivity in coastal wetlands and their role in oxygen production per unit area within those habitats, aligning with the statement that they cycle more oxygen per unit area in certain global contexts and contribute to sustaining human populations through ecosystem services.

Overall takeaway: the reasoning centers on comparing per-area primary production and the distinctive productivity of mangrove wetlands in coastal environments, while recognizing that extremely high-productivity biomes like tropical rainforests also contribute substantially to global oxygen dynamics. The prompt identifies mangroves as the correct option among the given choices.

Biol 1106 Rosenzweig Sp2025 CRN's11552 & 11553 Final Exam Lessons 1-24 - Requires Respondus LockDown Browser

Which of the following biomes cycle more oxygen per unit area globally than any other, so are crucial for sustaining human populations everywhere.

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