capability和ability的区别及用法，哪位大神知道啊

sky89757

The coyote is one of several recent ecologicalsuccess stories: along with the white-tailed deer, the moose, and other speciesthat are enlarging their natural domains, they have established themselvesas supreme adapters in an era when the capability to adjust to theenvironmental changes wrought by human beings has created a whole new class ofdominant large mammals.

A.    they have establishedthemselves as supreme adapters in an era when the capability

B.    they have establishedthemselves as being supreme adapters in an era when being able

C.    it has establisheditself as a supreme adapter in an era when to be able

D.    it has established itselfas being a supreme adapter in an era when its ability       (E)

E.    it has establisheditself as a supreme adapter in an era when the ability

Prep 2008一道题，我自己选出了答案，但解释里对于ability 和capacity的解释不清晰，想问他们的区别

有人说have capability of doing算错，可是manhattan里有一句话是对的呀Unlike humans and guinea pigs, most mammals have the capability of synthesizing Vitamin C from glucose, a simple sugar. (have the capability of doing) RIGHT

请大神们指教！！！！！

sky89757

upup

Charlotte97

后面版本的曼哈顿已经改为这个答案为错了，在练习题里。