首页
登录
职称英语
The cycle of fluctuation in snowshoe hare populations is unusual among anima
The cycle of fluctuation in snowshoe hare populations is unusual among anima
游客
2024-01-10
64
管理
问题
The cycle of fluctuation in snowshoe hare populations is unusual among animal species in that it is remarkably regular—peaking every eight to eleven years—and broadly synchronized over a vast area. Declines from peak levels are initiated by markedly lower overwinter survival of young hares, sharp decreases in birth rates, and a declining survival rate for adult hares. The onset of population increases is brought about by greatly improved rates of survival and birth.
Some biologists hypothesize that the cycle begins when peak snowshoe hare populations exceed their winter food supply; resulting malnutrition triggers a population decline. As hare numbers fall, the ratio of predators to hares increases, as does the impact of predation on the hare population. This extends the decline beyond the period of winter food shortage. Hare scarcity then causes predator population declines, and with fewer predators and more abundant winter food, the hare population begins another cyclic increase. The high mobility of predators responding to local differences in hare abundance contributes to interregional synchrony. [br] According to the passage, biologists have suggested which of the following about snowshoe hare population fluctuations?
选项
A、Their regularity is due to the persistent threat of malnourishment that young hares face.
B、They are similar in length to those of other species of hare.
C、Their synchrony can be partly explained by the ability of predators to change the areas in which they hunt.
D、Their variation from region to region is partly due to regional differences in the availability of alternate prey for predator.
E、Their regularity is due to the constant availability of the food sources hares rely on.
答案
C
解析
C正确,对应最后一句。
转载请注明原文地址:https://www.tihaiku.com/zcyy/3349358.html
相关试题推荐
Thespatialdistributionofdifferentracialandethnicpopulations
Thespatialdistributionofdifferentracialandethnicpopulations
Thespatialdistributionofdifferentracialandethnicpopulations
Thespatialdistributionofdifferentracialandethnicpopulations
Intheclassroom,Carolwasunusually______;ontheplayground,however,shebec
Althoughitisunusualtodenouncemuseum-goersfornotpainting,itisquiteco
Thecycleoffluctuationinsnowshoeharepopulationsisunusualamonganima
Thecycleoffluctuationinsnowshoeharepopulationsisunusualamonganima
Recentlyanunusuallyhighnumberofdolphinshavebeenfounddeadofinfect
Computerprogramsareunusualinthattheyarevirtuallytheonlyproductst
随机试题
Task3CompanySuccessThecompanyyouworkforhasrecentlywonanawardforit
竣工结算价为总结算价减去竣工结算前已付工程款。()
国家重点保护的野生动物分为划分为()两级。A.国家级、地方级 B.国家级、省级
《资治通鉴》采用的体裁是()。A.经传体 B.政书体 C.编年体 D.
下列财产中,属于房地产范畴的有()。A.房地产开发用地 B.种植在房前
A. B. C. D.
某服装厂(增值税一般纳税人)将服装1000件用于对外投资,已知每件衣服的对外不含
关于金属矿产资源开发项目的资源利用评价的说法,错误的是( )。(新教材已删除)A
机械工业生产中,加热金属等可成为红外线辐射源,铸造工、锻造工、焊接工等工种可接触
下列关于费用偏差和进度偏差分析时各种项目的计算式正确的是()。A.进度偏差=拟完
最新回复
(
0
)