The distinction may be seen in an internal parasite (such as a fluke), where the bodily structure is greatly simplified, but nevertheless the organism is highly adapted to its unusual environment.

 
  • 这种区别可以在一种体内寄生虫(如吸虫)中看出。吸虫的身体结构大大简化,但它高度适应其独特的环境。
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