[求助]补充：209

janegaojians

209，over the last century,paleontologists have used small differents between fossil speciments to calssify triceratops into sixteen species.this calssification is unjusted,however,since the specimens used to distinguish eleven of the species come from animals that lived in the same area at the same time.


A not every species that lived in a given area is preserved as a fossil


b,at least one individual of every true species of tricetatops has been discovered as a fossil specimen


c,no geographical area ever supports more than three similar species at the same time.


原文是不是说：老的分类是tri那个东东可以分为16类，但是这个分类不好，因为被用于分11类的标本来源于同一时期的同一地方。


C，WHY？

johnsonwxjs

15. Over the last century, paleontologists have used small differences between fossil specimens to classify triceratops (assume living in A in 1500) into sixteen species. This classification is unjustified, however, since the specimens (fossil specimens) used to distinguish eleven of the species come from animals (triceratops) that lived in the same area at the same time (living in A in 1500).

C) No area ever supports more than three similar species at the same time. (如果similar species确实可以因为small difference被分开，则11 +N (N<=3)<=14<16) 这里３可以被<=4的数替代）

janegaojians

since the specimens （used to distinguish eleven of the species ）come from animals that lived in the same area at the same time 这句话的意思是：16种标本中的11种来源于同一个时间的同一个地方。对吗？剩下4种来源于不同的地方。（我原来的理解有问题） 11 +N (N&lt;=3)&lt;=14&lt;16能再解释一下吗？谢谢

chelseayang

 一个地方不可能生存超过三个类似的种群，那么从一地分出十一个是不是就比较荒谬

了呢？