plesiomorphous

例句：

1. 1.The two species are closely related and share a common ancestor.
   这两种物种关系密切，共享一个共同的祖先。
2. 2. The plesiomorphous nature of the fossil record suggests that life has been evolving for millions of years.
   化石记录的同源性表明，生命已经进化了数百万年。
3. 3. The study of plesiomorphous organisms can provide insights into the evolution of complex life forms.
   研究同源生物可以提供对复杂生命形式进化的见解。