Q4.25. Humans have dramatically increased the amount of bioavailable nitrogen circulating globally. Which of the following mechanisms is not contributing to this anthropogenic increase? O Increased denitrification O Fossil fuel combustion O The Haber-Bosch process O Nitrogen-fixing crops

please draw! Create a model which accurately, in detail, depicts the potential pathways of carbon (biomass) and energy in an ecosystem with at least five trophic levels (don’t forget your decomposers, they can count as one trophic level). Make sure to incorporate the multiple pathways that biomass and energy could take at each trophic level. Lastly, clearly illustrate how carbon and energy flow in this ecosystem. Be sure to include adequate levels of detail for all pathways and differentiate the flow of carbon and energy in your model.

Immediately after deforestation, which of the following processes might you expect to increase with respect to nitrogen cycling? (Select all correct) Mineralization of org-N Immobilization of inorg-N Leaching Denitrification I would expect no change

All of the following carbon sources can be used for nutrition, by at least some exclusively heterotrophic organisms, with the exception of: CH3CH2OH CO2 HCOOH CH4 CH3COOH

Q4.22. A researcher is studying the global biogeochemical cycling of nutrient X, and they have determined that its storage rate in the oceanic subsystem is -10 Pg y¹. What can be concluded from this observation? Use the dropdowns below to complete your answer. The oceanic nutrient X pool size is cycles are closed, the pool size of Submit increasing decreasing , and because Earth's global biogeochemical nother subsystem is Reset

Can you help label a nitrogen cycle diagram, please?

CONTENTS Section 4: Global Biogeochemical Cycles Nutrient Cycling SimUText 2022-2023 Primary Production Submit Q4.23. Some researchers have hypothesized that the feedback loop pictured below influences the carbon dynamics of Arctic ecosystems as follows: Elevated atmospheric CO₂ levels cause the climate to warm, thawing permafrost. Nitrogen mineralization is then stimulated as thawed permafrost decomposes. The resulting increase in soil ammonium then stimulates primary production, which pulls CO₂ from the air. What kind of feedback is described? Temperature-Mineralization Feedback 22/23 + CO₂ Level N- Mineralization + Temperature + A positive feedback that amplifies the initial change A negative feedback that dampens the initial change A feedback that probably dominated pre-industrial carbon cycling A feedback that will not affect climate change forecasts NOTES QUESTIONS