首页
登录
职称英语
What evolutionary change in birds led to a nest’s building? [br] [originaltext]
What evolutionary change in birds led to a nest’s building? [br] [originaltext]
游客
2023-10-21
56
管理
问题
What evolutionary change in birds led to a nest’s building? [br]
Many egg-laying animals merely lay their eggs and leave. Turtles, for instance, and horseshoe crabs, the eggs are hatched and the little ones are on their own. The current theory about birds is the earliest birds did just that when they were cold-blooded creatures living in warm places. However, when they became warm-blooded creatures living in cold places, they had to remain on the eggs to keep them warm. For this, they needed a place—a nest. Very likely, the first nest was just a primitive hole scraped in the ground. Even now many species still lay eggs in this sort of crude nest. Primitive nests found on the ground were fine for some birds, but others began to elevate their nests in branches, perhaps to avoid predators. These early elevated nests were probably cup-shaped nest. This type is still built by some birds today. The latest development in nest, the most recent vision, so to speak, is the cup-shaped nest. This is the one we regard today as the typical bird’s nest, you know, like a robin’s nest.
选项
A、To avoid predators.
B、To expose the eggs to stronger sunlight.
C、To have a better view of predators.
答案
A
解析
根据此句others began to elevate their nests in branches,perhaps to avoid predators,可知A项正确。
转载请注明原文地址:https://tihaiku.com/zcyy/3116499.html
相关试题推荐
A.incomeB.polarizationC.transformationsD.oldE.changesF.worse
A.incomeB.polarizationC.transformationsD.oldE.changesF.worse
A.incomeB.polarizationC.transformationsD.oldE.changesF.worse
A.incomeB.polarizationC.transformationsD.oldE.changesF.worse
A.incomeB.polarizationC.transformationsD.oldE.changesF.worse
A.incomeB.polarizationC.transformationsD.oldE.changesF.worse
A.incomeB.polarizationC.transformationsD.oldE.changesF.worse
A.incomeB.polarizationC.transformationsD.oldE.changesF.worse
A.incomeB.polarizationC.transformationsD.oldE.changesF.worse
A.incomeB.polarizationC.transformationsD.oldE.changesF.worse
随机试题
Therearemanywaysinwhichthephenomenaoflanguageandcultureareint
Thepurposeofwritingaletterofapplicationisto______.[br]Fortheconven
1.题目:《蹲踞式跳远》片段教学 2.内容: 3.基本要求: (1)试
男性,35岁建筑工人,在建筑工地不慎致眼球穿透伤,拟全麻下行眼球摘除术。下列哪个
某地方政府策划开展一项大型电子政务建设项目,项目建设方在可行性研究的基础上开展项
流动资金贷款是用于借款人固定资产投资的本外币贷款。
以下关于可转换债券的说法中,错误的是()。A.转换价格越低,表明在既定的转换
男性,70岁,近1个月出现活动后心悸、气短,双肺底可闻湿性啰音,腹部检查肝脾未及
布雷顿森林体系下的汇率制度属于()。A.自发的浮动汇率制度 B.自发的固定汇
绿色建筑评价指标体系由5类指标组成,包括()等。A.安全耐久 B.环保节能
最新回复
(
0
)