首页
登录
职称英语
[originaltext] I’m going to pass this piece of amber around so you can see t
[originaltext] I’m going to pass this piece of amber around so you can see t
游客
2025-02-09
16
管理
问题
I’m going to pass this piece of amber around so you can see this spider trapped inside it. It’s a good example of amber-inclusion, one of the inclusions that scientists are interested in these days. This particular piece is estimated to be about 20 million years old. Please be extremely careful not to drop it. Amber shatters as easily as glass. One thing I really like about amber is its beautiful golden color.
Now, how does the spider get in there? Amber is really fossilized tree resin. Lots of chunks of amber contain insects like this one or animal parts like feathers or even plants. Here is how it happens. The resin oozes out of the tree and the spider or leaf gets in cased in it. Over millions and millions of years, the resin hardens and fossilizes into the semiprecious(次珍贵的、准宝石的) stone you see here.
Ambers can be found in many different places around the world. But the oldest deposits are right here in the United States, in Appalachia(阿巴拉契亚). It’s found in several other countries, too, though right now scientists are most interested in ambers coming from the Dominican Republic(多美尼加共和国). Because it has a great many inclusions, something like one insect inclusion for every one hundred pieces. One possible explanation for this it that the climate is tropical and a greater variety of number of insects thrive in tropics than in other places. What’s really interesting is the scientists are now able to recover DNA from these fossils and study the genetic material for important clues to revolution.
选项
A、Amber mined from the Appalachian Mountains.
B、Amber with no imperfections.
C、Amber containing organic material.
D、Amber with no inclusions.
答案
C
解析
What type of amber is probably the most valuable for genetic research?
转载请注明原文地址:https://tihaiku.com/zcyy/3949205.html
相关试题推荐
Earlyoccupationsaroundtheri
Earlyoccupationsaroundtheri
Onthebeachtherewasacastofa______.[br]【20】[originaltext]Presente
Onthebeachtherewasacastofa______.[br]【18】[originaltext]Presente
Onthebeachtherewasacastofa______.[br]【17】______[originaltext]Pr
Onthebeachtherewasacastofa______.[br]【16】______[originaltext]Pr
【31】[br]【39】[originaltext]Lecturer:Inthelastlecture,welookedatthe
【31】[br]【37】[originaltext]Lecturer:Inthelastlecture,welookedatthe
【31】[br]【36】[originaltext]Lecturer:Inthelastlecture,welookedatthe
【31】[br]【33】[originaltext]Lecturer:Inthelastlecture,welookedatthe
随机试题
环球健康保险公司最近承担了一个大型企业的健康险业务,为12000人提供报销型保险
下面哪一个不是制作金属面的适应证()A.力较小且龈距和近远中距尚可的
患者男,62岁。被摩托车撞伤腹部出现持续性腹痛伴呕吐、血压下降1小时急诊入院。既
房地产市场细分依据中,()是最传统的市场细分依据。A:人口统计因素 B:地理
在治疗性沟通的交谈阶段,护士提出问题时应注意的是A.最好一次把所有的问题都提出
2、下列各项工作可以不用操作票:()。 A.事故紧急处理
犯罪嫌疑人刘某,因涉嫌组织、领导、参加黑社会性质组织罪被公安机关立案侦查,关于侦
依据《个人所得税法》,下列表述正确的是:A.在中国境内有住所的纳税个人就从中国境
位于市区的某文创企业为增值税一般纳税人,2021年5月经营业务如下: (1)
(2019年真题)平均资本成本计算涉及对个别资本的权重选择问题,对于有关价值权数
最新回复
(
0
)