Question

consider this model of the carbon cycle. what factors influence the input and output of carbon through earths spheres? a the oceans on earth act as carbon sinks. b the combustion of fossil fuels contributions to an increase in atmospheric carbon dioxide. c animals are solely responsible for the release of carbon dioxide via respiration. d atmospheric co₂ is continuously exchanged with the oceans and on land. e mans activities on earth contribute to the decrease of atmospheric co₂. f vegetation and soil take in more co₂ than they release.

Explanation:

• Option A: Oceans absorb carbon (act as sinks), influencing carbon input/output.
• Option B: Fossil fuel combustion releases CO₂, increasing atmospheric carbon (affects input).
• Option D: Continuous CO₂ exchange between atmosphere, oceans, and land (key for carbon cycle balance).
• Option F: Vegetation and soil uptake more CO₂ (carbon sink aspect, influences input).
• Option C: Plants also release CO₂ via respiration, so animals aren't sole responsible.
• Option E: Human activities (e.g., deforestation, fossil fuel use) generally increase, not decrease, atmospheric CO₂.

Answer:

A. The oceans on Earth act as carbon sinks.
B. The combustion of fossil fuels contributions to an increase in atmospheric carbon dioxide.
D. Atmospheric CO₂ is continuously exchanged with the oceans and on land.
F. Vegetation and soil take in more CO₂ than they release.