ENVT_Exam1 - An ecosystem is best defined as a a grouping...

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An ecosystem is best defined as a. a grouping of plants, animals, and microbes occupying an explicit unit of space and interacti ng with each other and their environment An organism accidentally introduced into the Black Sea in 1970s that has caused local fishery to decline significantly is the: a. a jellyfish like organism called a ctenophore . Approximately what percentage of biomass energy will be passed on to the next trophic level in a typical food chain? c. 10 percent A pyramid age structure diagram indicates: b. an increasing population growth rate. All species on Earth have been identified. False All primary consumers belong to what tropic level of a food chain? b. trophic level two A farmer grows and plows under a crop of alfalfa (a legume) to enrich his/her soil with c. nitrogen As a society becomes more affluent e. a. and b. only Birth rates tend to decline with a. an increased standard of living. b. increasing levels of education. c. social security programs that guarantee support into old age.
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d. delaying motherhood past the teenage years. e. all of the above Causes of the loss of tropical rainforest is/are e. all of the above Different species tend to have different All of the above Dividing the demographic constant 70 by the percentage rate of population increase gives c. the number of years it will take a population growing at constant rate to double Energy a . recycles through the ecosystem. Ecosystem is sustainable because e . a and c only. Each American consumes some ___?___ times of resources than people living in LDCs a . 30 timesa . Effective way(s) of reducing population growth in developing countries is/are to e. all of the above Fishing for salmon at a sustainable level is considered ________ of a natural resource. a . co nservation
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George’s Bank was officially closed by National Marine Fisheries Service On December 12, 199 4 because b. Prime commercial species , such as Atlantic cod, has gone commercial extinct.
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