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
67
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://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
Completethenotesbelowusingwordsfromthebox.ArtGalleryCathedralCastle
(1)Scottishcustomsandtraditionscoveraverywiderangeoftopics.Everyt
[originaltext]AstronomershavefoundatleastsevenEarth-sizedplanetsorb
A—RelevanceofmotivationtheoriesB—SystematicTrainingC—Personnelmanagement
A.注意危险 B.右侧绕行 C.左侧绕行 D.单向通行
企业对材料采用计划成本核算。2010年5月购人钢材100t,增值税专用发票注明每
按照有关规定,房屋的完损等级分为()。A.危险房 B.基本完好房 C.一般
程序性知识也叫{pz_填空},是个体难以清楚陈述、只能借助于某种作业形式间接推测
材料题 根据以下材料,回答题 2015年,某航空公司准备在其商用零售部门安装
为了有效控制施工机械使用费的支出,施工企业可以采取的措施有()A.加强设备租
最新回复
(
0
)