ecosystems

ecosystems : Ecosystem respiration is the sum of all respiration occurring by the living organisms in a specific ecosystem. Ecosystem respiration is typically measured in the natural environment, such as a forest or grassland field, rather than in the laboratory. Ecosystem respiration is the production portion..   More from Wikipedia

ecosystems : Ecosystem valuation is a widely used tool in determining the impact of human activities on an environmental system, by assigning an economic value to an ecosystem or its ecosystem services. The simplest form of ecosystem valuation for economists is to hold that an ecosystem has a value equivalent..   More from Wikipedia

  www.myspace.com All living things require energy to carry out life functions such as growth, movement, and reproduction. For nearly all ecosystems diverse collections of species that interact with each other and their physical environment the major source of energy is the sun. The flow of energy tends to follow the same basic pattern whether the ecosystem is a tropical rainforest or a coral reef. To portray the transfer of energy through an ecosystem, ecologists use simple models called food ...

  A brief overview of the brilliance that is grassland ecosystems

Question : 1. List some reasons why humans would select one plant over another plant in a park 2. Suggest some reasons a plant might be categorized as a weed. 3. List abiotic factors of the city park and meadows. 4. Which of the two ecosystems, the meadow or park, would provide a better habitat for a fox? Give reasons.

Answer : start from here:http://rds.yahoo.com/_ylt=A0geu.qSw_hGd7UA57hXNyoA;_ylu=X3oDMTE5MzVicWY5BHNlYwNzcgRwb3MDNgRjb2xvA2FjMgR2dGlkA0gwMjFfMTg4BGwDV1Mx/SIG=11rlv9pcs/EXP=1190794514/**http%3a//en.wikipedia.org/wiki/Ecosystems..   More from Yahoo Answers

Question : In a natural ecosystem, the wastes from the organisms that live there are usually broken down and recycled in that ecosystem. How do urban ecosystems deal with human wastes? What other wastes are created in urban ecosystems? What is done with them?

Answer : In large cities, the sewage goes to central processing facilities where it is processed through a variety of methods including settling (to separate solids from liquids), chlorination (to kill of nasty pathogens), microbial activity (to break down as much of the solid as possible). The water part of the waste is treated using chemicals and then it is usually released into rivers or put back into city water supply. The solids can be dealt with a number of ways. They can be made into sludge that is used as industrial fertilizer, they can be incinerated, they can be put into a landfill. More often now before their final destination they are being used to produce methane gas as an energy supply. NYC has a great schematic diagram of their waste treatment process at: http://www.nyc.gov/html/dep/images/features_widecolumn/wastewater_treatment_process_layout_lg.jpg Other wastes: All our trash including food wastes, paper wastes, glass, metal, chemicals. Most go to the landfill. ....   More from Yahoo Answers