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Fill in each numbered blank with ONE suitable word to complete the passage below. Write it on your answer sheet. (2.0 points)
When an animal species is (1) _______ endangered, it means that the International Union for Conservation of Nature (IUCN) has evaluated it as nearly (2) _______, which means that a significant portion of its range has already died (3) _______ and the rate of birth is lower than the species' death rate.
Today, more and more animal and plant species are on the verge of extinction because of a (4) _______ of major factors that cause a species to become endangered, and as you might expect, humans play a role in quite a few of them - in fact, the biggest threat to endangered animals is human encroachment on their habitats. By analyzing and grouping many individual cases, (5) _______, we find the same broad causes appearing again and again. They are habitat destruction, exotic species, and overexploitation. Among other (6) _______ threatening particular species are limited: distribution, disease, and pollution. Limited distributions are often a (7) _______ of other threats: populations confined to one or a few small areas because of habitat loss, for example, may be disastrously affected by random factors.
Diseases can have severe (8) _______ on species lacking natural genetic protections against particular pathogens, like the rabies and canine distemper viruses that are currently devastating carnivore populations in East Africa. Domestic (9) _______ are usually the reservoirs of these and other diseases affecting wild populations, showing once again that human activities lie at the root of most causes of endangerment. Pollution has seriously done harm (10) _______ number of terrestrial species, although species living in freshwater and marine ecosystems are also suffering.
When an animal species is (1) _______ endangered, it means that the International Union for Conservation of Nature (IUCN) has evaluated it as nearly (2) _______, which means that a significant portion of its range has already died (3) _______ and the rate of birth is lower than the species' death rate.
Today, more and more animal and plant species are on the verge of extinction because of a (4) _______ of major factors that cause a species to become endangered, and as you might expect, humans play a role in quite a few of them - in fact, the biggest threat to endangered animals is human encroachment on their habitats. By analyzing and grouping many individual cases, (5) _______, we find the same broad causes appearing again and again. They are habitat destruction, exotic species, and overexploitation. Among other (6) _______ threatening particular species are limited: distribution, disease, and pollution. Limited distributions are often a (7) _______ of other threats: populations confined to one or a few small areas because of habitat loss, for example, may be disastrously affected by random factors.
Diseases can have severe (8) _______ on species lacking natural genetic protections against particular pathogens, like the rabies and canine distemper viruses that are currently devastating carnivore populations in East Africa. Domestic (9) _______ are usually the reservoirs of these and other diseases affecting wild populations, showing once again that human activities lie at the root of most causes of endangerment. Pollution has seriously done harm (10) _______ number of terrestrial species, although species living in freshwater and marine ecosystems are also suffering.
