Polar bears live on the ice cap near the North Pole. Their numbers aredwindling, apparently because of both pollution and global climatechange. List some specific ways that the melting of the Arctic ice capmight affect polar bear populations.
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Polar bears live on the ice cap near the North Pole. Their numbers are
dwindling, apparently because of both pollution and global climate
change. List some specific ways that the melting of the Arctic ice cap
might affect polar bear populations.
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- Explain how the three major types of deserts differin their climate and vegetation. Why are desert ecosystems vulnerable to long-term damage? How dodesert plants and animals survive? Explain how thethree major types of grasslands differ in their climateand vegetation. What is a savanna? Explain howsavanna animals survive seasonal variations in rainfall (Core Case Study). Why is the elephant an important component of the African savanna? DescribeTuy Sereivathana’s efforts to prevent elephants frombecoming extinct in Cambodia. Why have manyof the world’s temperate grasslands disappeared?Describe Arctic tundra and define permafrost?Explain how the three major types of forests differin their climate and vegetation. Why is biodiversityso high in tropical rain forests? Why do most soils intropical rain forests hold few plant nutrients. Whydo temperate deciduous forests typically have a thicklayer of decaying litter? What are coastal coniferousor temperate rain forests? How do most species…The Earth's climate has changed throughout history. Just in the last 650,000 years there have been seven cycles of glacial advance ar etreat, with the abrupt end of the last ice age about 7,000 years ago marking the beginning of the modern climate era and of human Civilization. Most of these climate changes are attributed to very small variations in Earth's orbit that change the amount of solar ene our planet receives. The current warming trend is of particular significance because most of it is very likely human-induced and proceeding at a very rapid rate not seen in the past 1,300 years. Earth-orbiting satellites and other technological advances have enabl- scientists to see the big picture, collecting many different types of information about our planet and its climate on a global scale. www.om Warming oceans Carbon dioxide levels continue to rise. The Greenland and Antarctic ice sheets have decreased in mass. Desertification has increased due to the rapid evaporation of freshwater…The Atlantic cod population is of primary economic importance to fishingcommunities throughout the maritime provinces in Canada. Unfortunately, thispopulation has underwent an extreme collapse in recent years due to overfishing.Some argue, however, that the collapse of the cod population may actually beattributed to an increase in the population of harp seals, a known predator ofcod. One suggestion to help cod stocks recover is therefore to permit the huntingof harp seals on a large scale. Suggest and explain one potentially negativeconsequence of limiting the harp seal population.
- Some Aleutian Islands are surrounded by urchin barrens while others are surrounded by kelp forests. Which statement gives the primary explanation for these differences? O The kelp forest islands experience a substantially warmer climate than do the urchin barren islands. Grazing by urchins prevents the formation of kelp forests. Kelp forest islands and urchin barren islands differ with respect to oceanic currents. O Kelp eat urchins, thus preventing their establishment.What evidence is there that variation in atmospheric CO2 concentration islinked to variation in global temperatures? In recent years, the governments of mostcountries of the world have been working hard to develop international agreementsto regulate CO2 emissions. Why are these governments concerned? How might rapidchanges in global temperatures lead to the extinction of large numbers of species?How might changes in global temperatures affect agriculture around the world?The warming trends discussed in the Case Study are most pronounced at the equator, where sunlight is most direct. What would you predict the effect of global warming to be nearer the poles, where temperatures are lower and there is less sunlight?
- Which of the following statements about atmospheric carbon dioxide levels is correct? For about 800,000 years prior to human influence it varied between 180 and 300 ppm and is now above 410 ppm. For about 800,000 years prior to human influence it never exceeded 200 ppm. Its rate of increase in the past century is greater than any seen in the ice core record. Both 1 & 3In addition to climate change, polar bears also face threats from pollution. Describe in two ways in which the polar bear population in the Arctic is affected by pollution. Give detailed explainations.Aside from the rise in mean temperature and CO2 levels, what are some other pieces of evidence from global warming? Discuss.
- If you were to hike up MountKilimanjaro in Tanzania, youwould pass through severalhabitats, including savanna atthe base, forest on the slopes,and alpine tundra near thetop. Explain how such diversehabitats can be found at onelocation near the equator.Tropical areas near the equator have higher species diversity than do temperate areas at high latitudes. Discuss several of the proposed causes. Be sure to mention the contribution of past global climate change.Why does the disappearance of beaver from an ecosystem cause a decrease in the wolf population in the ecosystem?