首页
登录
职称英语
Many prehistoric people subsisted as hunters and gatherers. Undoubtedly,
Many prehistoric people subsisted as hunters and gatherers. Undoubtedly,
游客
2024-01-05
86
管理
问题
Many prehistoric people subsisted as hunters and gatherers. Undoubtedly, game
animals, including some very large species, provided major components of human diets.
An important controversy centering on the question of human effects on prehistoric wildlife
concerns the sudden disappearance of so many species of large animals at or near the end
(5) of the Pleistocene epoch. Most paleontologists suspect that abrupt changes in climate led
to the mass extinctions. Others, however, have concluded that prehistoric people drove
many of those species to extinction through over-hunting. In their "Pleistocene overkill
hypothesis," they cite what seems to be a remarkable coincidence between the arrival of
prehistoric peoples in North and South America and the time during which mammoths,
(10) giant ground sloths, the giant bison, and numerous other large mammals became extinct.
Perhaps the human species was driving others to extinction long before the dawn of history.
Hunter-gatherers may have contributed to Pleistocene extinctions in more indirect
ways. Besides over-hunting, at least three other kinds of effects have been suggested:
direct competition, imbalances between competing species of game animals, and early
(15) agricultural practices. Direct competition may have brought about the demise of large
carnivores such as the saber-toothed cats. These animals simply may have been unable
to compete with the increasingly sophisticated hunting skills of Pleistocene people.
Human hunters could have caused imbalances among game animals, leading to the
extinctions of species less able to compete. When other predators such as the gray wolf
(20) prey upon large mammals, they generally take high proportions of each year s crop of
young. Some human hunters, in contrast, tend to take the various age-groups of large animals
in proportion to their actual occurrence. If such hunters first competed with the larger
predators and then replaced them. they may have allowed more young to survive each year,
gradually increasing the populations of favored species As these populations expanded,
(25) they in turn may have competed with other game species for the same environmental niche,
forcing the less hunted species into extinction. This theory, suggests that human hunters
played an indirect role in Pleistocene extinctions by hunting one species more than another.
选项
A、The effects of human activities on prehistoric wildlife
B、The origins of the hunter-gatherer way of life
C、The diets of large animals of the Pleistocene epoch
D、The change in climate at the end of the Pleistocene epoch
答案
A
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3335442.html
相关试题推荐
Lookatthefollowingpeopleandthelistofstatementsbelow.Matcheachperson
Lookatthefollowingstatements(Questions8-11)andthelistofpeoplebelow.Ma
Lookatthefollowingstatements(Questions18-22)andthelistofpeopleintheb
Lookatthefollowingstatements(Questions18-22)andthelistofpeopleintheb
Lookatthefollowingstatements(Questions18-22)andthelistofpeopleintheb
Lookatthefollowingstatements(Questions18-22)andthelistofpeopleintheb
Lookatthefollowingstatements(Questions4-10)andthelistofpeoplebelow.Ma
Lookatthefollowingstatements(Questions4-10)andthelistofpeoplebelow.Ma
Lookatthefollowingstatements(Questions4-10)andthelistofpeoplebelow.Ma
Lookatthefollowingstatements(Questions4-10)andthelistofpeoplebelow.Ma
随机试题
Ireallyappreciateyour(offer)______tohelpme.offering本题测试的是动词的惯用法。“appreci
TheWhiteHouseistheofficialresidenceofthePresidentoftheUnitedSt
某公司拟配置存储容量不少于9TB的磁盘阵列用于存储数据。假设只能购买每块存储容量
2岁小孩,双侧先天性髋关节脱位.最佳治疗方案可选A.牵拉复位 B.手术切开复位
患者,男,46岁。心胸阵作隐痛,疾走则发,胸闷气短,动则甚,心悸,倦怠无力,神疲
婴儿添加辅食的原则,错误的是A.每种辅食都应从少量开始 B.由稠到稀 C.从
各种运输方式内外部的各个方面的构成和联系,就是( )。 A.运输系统
(2017年真题)甲企业生产一种产品,每件产品消耗材料10千克。预计本期产量15
甲公司拥有一栋办公楼,成本为1200万元,预计使用寿命为20年,预计净残值为20
非霍奇金淋巴瘤化疗首选的方案是() A.MP方案 B.CHOP方案 C.M
最新回复
(
0
)