Which of the following is true of dietary reference intake? Are recommended dietary intake of O nutrients in a specific life stage and gender group Are based on educated guess which O makes them nonspecific to the population Are set of recommendations based O on specific calories diet for all population All mentioned options are true
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- amphibian populations are decliningrapidly worldwide. the fungus Batrachochytrium dendrobatidis (Bd) has contributedto this decline: this pathogen causes severeskin infections in many amphibian species,leading to massive die-offs. efforts to saveamphibians from Bd have met with limitedsuccess, and there is little evidence thatfrogs and other amphibians have acquiredresistance to Bd on their own.Humans have the most urgent need for a continuoussupply of ________.a. foodb. nitrogenc. oxygend. waterIn an ecosystem, these organisms are responsible for convertingsolar energy to the stored energy found in organic compounds. a. herbivoresb. decomposersc. producersd. carnivorese. None of these are correct.
- Some analysts argue that in order to continue usingoil at the current rate, we must discover and add toglobal oil reserves the equivalent of two new SaudiArabian reserves every 7 years. Do you think this ispossible? If not, what effects might the failure to findsuch supplies have on your life and on the lives ofany children and grandchildren that you might eventually have?Macular degeneration is a serious disease of the eyes that can lead to blindness. A recent study suggeststhat nutrients such as lutein and zeaxanthin, found in green leafy vegetables, can slow the onset andprogress of this disease in humans. In the study, a group of 2000 older individuals were contacted throughrandom digit dialing and asked about their eating habits. (Macular degeneration usually manifests later inlife.) The group who ate green leafy vegetables fewer than two times a week had a significantly higher rateof macular degeneration (25% higher) than those who ate green leafy vegetables five or more times perweek. They also had a higher rate (5%) of cases that were considered severe among those who had thedisease.(a) Determine whether the study is an observational study or an experiment. Explain how you know.(b) If the study is an experiment, identify the control and treatment groups. If the study is observational,state whether it is a case-control study, and if so, identify…Thetiger beetle Cicindela longilabris inhabits higher latitudes and elevationsthan other North American tiger beetles; Schultz, Quinlan, and Hadley concludedthat all of the following factors contributed to these cooler environmentalpreferences, except:a.higher metabolic rates.b.lower body temperatures.c.increased water proofing.d.both higher metabolic rates and lower body temperatures.e.both higher metabolic rates and increased water proofing.
- Age structure diagrams for two hypothetical human populations are shown below. Describe the growth rate of each population and discuss the current and future social and economic problems that each is likely to face.The Barton Springs salamander is an endangered species found only inthree adjacent springs in the city of Austin, Texas. There is growingconcern that a chemical spill on a nearby freeway could pollute thespring and wipe out the species. To provide a source of salamanders torepopulate the spring in the event of such a catastrophe, a proposal hasbeen made to establish a captive breeding population of the salamanderin a local zoo. You are asked to provide a plan for the establishment ofthis captive breeding population, with the goal of maintaining as muchof the genetic variation of the species as possible. What factors mightcause loss of genetic variation in the establishment of the captivepopulation? How could loss of such variation be prevented? With theassumption that only a limited number of salamanders can bemaintained in captivity, what procedures should be instituted to ensurethe long-term maintenance of as much variation as possible?Many people who want to reduce their ecological footprinthave focused on how much energy is expended (and howmany climate-warming greenhouse gases are emitted) intransporting food from its place of production to its place ofsale. The typical grocery store item is shipped by truck, air,and/or sea for many hundreds of miles before reaching theshelves, and this transport consumes oil. This concern over“food-miles” has helped drive the “locavore” movement tobuy and eat locally sourced food.However, food’s transport from producer to retailer, asmeasured by food-miles, is just one source of carbon emissionsin the overall process of producing and delivering food. In2008, environmental scientists Christopher Weber and H. ScottMathews conducted a thorough life-cycle analysis (p. 400) ofU.S. food production and delivery. By filling in the table below,you will get a better idea of how our dietary choices contribute toclimate change. After measuring mass, energy content, and dollar valuefor each…
- . This form of a food web begins with waste materials and theremains of dead organisms.a. aquaticb. detritalc. grazingd. atmospherice. geologicalPart A) A biologist notices that the same species of Tortoise exists in Texas and Mexico.Yet these tortoises have somewhat different life histories. This is probably due to the diverse array of__that each tortoise has with different components its own environment.a. interactionsb. conversationsc. adaptationsd. all of thesePartB.). If water amounts and food production capabilities decrease, what can happen to carrying capacity?a. increase b. decreasePart C. Alabama should be a desert but it is a lush green environment. What keeps us from being so dry?a. Hadley Cellsb. Ocean Gyresc. Mountainsd. all of the aboveMany people in less-developed countriesdie from tuberculosis, not because theirdisease is incurable, but simply becausethey do not have health insurance and cannotafford the medications. Why might itbe advantageous for the United States topay more for our medications so that pharmaceuticalcompanies can provide them tolower-income people at a reduced cost orfor free?