1. If Earth is filled muchly of di-nitrogen gas, why is the productivity of se many ecosystems limited by availability of nitrogen? What is biological nitrogen fixation? What factors influence the times and places where it occurs?

How do symbiotic bacteriause metabolic processes to produce biohydrogen from food waste? How are microbes usedin the bioremediation of contaminated groundwatersites? What is the relationship betweenthe position of a particular species in the foodchain and the energy required to maintain thatspecies?

Which of the nutrient cycles will barely contain an atmospheric component? Carbon cycle Hydrologic cycle Nitrogen cycle Phosphorus cycle

1.) Describe a food chain that has at least four different trophic levels. Label the tropic level (Producer, Primary consumer, Secondary Consumer, or Tertiary Consumer), whether the organism is a(n) autotroph or heterotroph, and provide an example of an organism at each tropic level.   2.)Name two biological processes involved in rapid carbon exchange:   3.)Name two geologic processes involved in long-term carbon exchange:

26. The ultimate reason why the number of trophic levels is limited in ecosystems is:   energy is recycled through systems slower than matter is. the limits of the biogeochemical cycles. when energy is transformed, some is usually lost as heat. the laws of decomposer efficiency.

Can you describe the nitrogen and phosphorous cycles in terms of nutrient availability please?

F4

Box 1 Please match the correct components of the nitrogen cycle to each numbered box. Not every word will match a box. Atmospheric nitrogen (N2226) 1 Producers Leaching. Soil Consumers Detritivores, scavengers, decomposers 3 Producers Consumers Detritivores scavengers, decomposers Nitrate (NO) 2 Ammonia (NEC) ammonium (NH) Nitrite (NO) 4 5 Relyea, Ecology. 9e, 2021 W. H. Freeman and Company

are water bodies natural factor or human factor?

Table 4 Gross productivity (mg/L/hr) Net productivity (mg/L/hr) Test tube % Light 2.38 1.52 100% -1.41 2 | -2.28 -3.62 - 3.89 -3.96 3 65% 25% .17 4 -0.95 -.17 10% 6. 2% LO