Earth has a total of 11.9 billion gha of productive land. How many people could Earth supportsustainably if the average ecological footprint were 8 gha per person (as in the United States)?

If there were already enough nutrients present, what would be the TWO most important characteristics of a terrestrial ecosystem that would result in HIGH NPP? (your answers will give a possible range of values - I want to know which end of the range generates high NPP.  If it was nutrients (which it is not), you might to say high levels of nutrients (as opposed to low levels).)

From the nitrogen cycle diagram below, which of the following is/are a process by which nitrogen can move into the dissolved ocean nitrogen pool? (Select all that apply) A- Denitrification B- Runoff C- Fossil fuel burning D- Agricultural N fixation E- Natural N fixation

You are studying primary productivity and biodiversity patterns of an ecosystem. The ecosystem is represented by the climatograph below. The Gross Primary Productivity (GPP) is measured to be 5000 grams of carbon per square meter per year, and the Total Respiration (RT) is measured to be 300 grams of carbon per square meter per year.  - What kind of biome is this? - Calculate the Net Ecosystem Production (NEP) for this ecosystem - What does the calculated NEP value indicate about the carbon balance and overall productivity of the ecosystem? (one sentence) - Based on both the climatograph and the NEP, what can you say about the biodiversity of plants versus consumers? Choice 1 of 4:plant biodiversity is greater than consumer biodiversity Choice 2 of 4:consumer biodiversity is greater than plant biodiversity Choice 3 of 4:consumer biodiversity is the same as plant biodiversity Choice 4 of 4:lower plant biodiversity compared to consumer biodiversity

Answer clearly

http://www.fao.org/nr/water/aquastat/data/query/index.html?lang=en.  Step 1.  Choose five nations (including the United States) from the enormous database by clicking the corresponding boxes. For "select variables", choose these three: 1. Under "Water Resources" choose "Total Renewable Water Resources" and within that choose only "Total Renewable Water Resources per Capita. 2. Choose "Water Use" and then "Pressure on Water Resources" . Within that subset choose only"SDG 6.4.2 Water Stress". "SDG" means the Sustainable Development Goal. This value is the percentage of total available water that is used by a nation. 3. Under "Water Use" choose "Water Withdrawal by Sector", and within that choose only "Total Water Withdrawal per Capita".     Nation                     Resources per Capita   Withdrawal per Capita  % Water Stress: withdrawal vs. resources)                                                       Step 2.    Based…

An estimated 1000 kg of plant plankton are needed to produce 100 kg of animal plankton. The animal plankton is in turned consumed by 10 kg of fish, the amount needed by a person to gain 1 kg of body mass. i) explain why the amount of biomass declines at each successive trophic level.

In a temperate grassland ecosystem, to tal primary production was 12,740 g/m/yr. Annual net secondary pro duction by the herbivorous insect community was 320.5 g/m2/yr. Total net tertiary production by spiders was 22.6 g/m/yr. Is productivity biomass-based or productivity-based?

what areas (lake, pond, stream) would you expect to have the highest rate of productivity? The lowest? Why?

Net ecosystem production is de fined as Onet primary productivity plus ecosystem respiration net primary productivity minus ecosystem respiration gross primary productivity minus autotrophic respiration gross primary productivity plus ecosystem respiration Ogross primary productivity minus ecosystem respiration