首页
登录
职称英语
Fossil formations like the Burgess Shale show that evolution cannot always b
Fossil formations like the Burgess Shale show that evolution cannot always b
游客
2025-02-06
26
管理
问题
Fossil formations like the Burgess Shale show that evolution cannot always be thought of as a slow progression. The Cambrian explosion involved rapid evolutionary diversification, followed by the extinction of many unique animals. Why was this evolution so rapid? No one really knows. Many zoologists believe that it was because so many ecological niches were available with virtually no competition from existing species. Will zoologists ever know the evolutionary sequences in the Cambrian explosion? Perhaps another ancient fossil bed of soft-bodied animals from 600-million-year-old seas is awaiting discovery.
What can be inferred from paragraph 7 about why the Cambrian explosion is so unusual?
选项
A、It generated new ecological niches through the extinction of many unique animals.
B、It was a period of rapid evolution, and evolution is often thought of as a slow process.
C、It is a period whose evolutionary sequences are clearly marked.
D、It generated a very large number of ancient fossil beds containing soft-bodied animals.
答案
B
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3944824.html
相关试题推荐
Athirdfossilformationcontainingbothsoft-bodiedandhard-bodiedanimals
Athirdfossilformationcontainingbothsoft-bodiedandhard-bodiedanimals
TheEdiacarafossilformation,whichcontainstheoldestknownanimalfossil
TheParkandBurgessmodelofgrowthinzonesandnaturalareasofthecity
ParkandBurgess’smodelhascometobeknownasthe"concentric-zonemodel"
ParkandBurgess’smodelhascometobeknownasthe"concentric-zonemodel"
ParkandBurgess’smodelhascometobeknownasthe"concentric-zonemodel"
Giventheseemingintelligenceofcetaceans,peoplearealwaystemptedtoco
NotonlycouldSmithidentifyrockstratabythefossilstheycontained,he
NotonlycouldSmithidentifyrockstratabythefossilstheycontained,he
随机试题
Commutershavea40percentgreaterriskofendingupdivorced,accordingt
ThelargeroftwonumbersexceedsthreetimesthesmallernumberbyThesumoft
______是平面设计中,密不可分的三位一体。一个好的版面是这三方面优秀发挥与结
进行肌力检查时,最先进行哪一级别的检查:A.0级 B.1级 C.2级 D.
高危妊娠包括以下哪几项:()A.孕妇年龄35岁 B.有阴道助产史者
偏头痛
负责药品采购供应、处方或者用药医嘱审核是A.药事管理与药物治疗学委员会(组)的职
某汽车货运公司上半年(1至6月共181天)拥有5吨载货汽车150辆及5吨挂车50
部门规章与地方政府规章之间对同一事项的规定不一致时,采取的解决方式是()。
(2015年真题)施工升降机是提升建筑材料和升降人员的重要设施,如果安令防护装置
最新回复
(
0
)