Ecologists call the physical location of a community its habitat.
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The human birth rate has remained about the same for the last 350 years.trueThe human population began to increase dramatically about 1500 years ago.falseThe exploding human population is the single greatest threat to the world's future.trueIn the early 1990s there was a global increase in efforts to reduce pollution.truePollution and the economy of the US are closely related.trueThere is nothing that an individual can do to affect environmental problems because the problem is just too large and complex.falseA group of organisms of different species living together in a particular place is called acommunityAn ecosystem consists ofa community of organisms, energy, the soil, water, and weather (all of the above)All of the following (soil, plants, water, weather) are abiotic factors of a habitat exceptplantsA relationship between a producer and consumer is best illustrated byzebra eating grassOrganisms that manufacture organic nutrients for an ecosystem are calledprimary producersRefer to the illustration. Killer whales feed at thethird and fourth trophic levelsRefer to the illustration. On the pyramid, animals that feed on plant eaters are no lower thanlevel cRefer to the illustration. The diagram represents the decrease inall of the aboveFood webs are more commonplace than food chains because..organisms almost always eat, and are eaten by, many different organismsAnimals that feed on plants are at least in thesecond trophic levelsWhich of the following are detritivores? (worms, vultures, fungi, all of the above)all of the aboveIn going from one trophic level to teh next higher levelthe amount of usable energy decreasesBecause energy diminishes at each successive trophic level, few ecosystems can contain more thanfour trophic levelsPrecipitation and evaporation are important components of thewater cycleHumans are affecting the carbon cycle by burning fossil fuels, destroying vegetation that absorbs carbon dioxide, using electrical labor-saving devices?all of the aboveWhich of the following is common to the carbon cycle, the nitrogen cycle, and the water cycle?The substance is required by all living things and is involved in many processes that occur in all living things.The decrease in species diversity of some lakes in the northeastern United States during the 20th century may best be explained byacid rainOzone in the atmosphereabsorbs harmful radiation from the sunThe greenhouse effect may increase on Earth becauseincreasing carbon dioxide will trap more heatRefer to the illustration #2. The graph showsBoth a and bIf a large amount of chemicals gets into a river or lake, the species diversityrecovers, but takes yearsRenewable sources of energyreplenish themselves naturallyDestruction of the tropical rain forestsall of the aboveRefer to the illustration #3. Which letter in the graph indicates the approximate world population in the year 1950?letter cThe current rate of population growth will result in a doubling of the world population every 39 years. With a current population of 6 billion, what will be the approximate world population in the year 2039 if nothing is done to change this rate?12 billionRefer to the illustration #4. According to the graph,the human population is currently rising dramaticallyRefer to the illustration #4. According to the graph, the human population,remained essentially unchanged for thousands of yearsPollutants produced by the burning of coal includecarbon monoxideWhat is the first step in solving an environmental problem?assessmentIn solving environmental problems, which of the following is not a part of public education?sending out brochuresEverything that organisms do in ecosystems, such as running, breathing, burrowing, and growing, requiresenergyEvery time that energy is transferred in an ecosystem, potential energy is lost asheatThe conversion of nitrogen gas to ammonia by the action of bacteria is callednitrogen fixationA knowledge of ______ is essential to solve our environmental problems.ecology