syzygetic tetrad

例句：

1. 1. The syzygetic relationship between the two species is a fascinating topic in evolutionary biology.
   这两种物种之间的共祖关系是进化生物学中一个引人入胜的话题。
2. 2. The syzygetic theory suggests that all living organisms share a common ancestor.
   共祖理论表明，所有现存生物都有一个共同的祖先。
3. 3. The discovery of fossils from the syzygium tree has provided valuable insights into the evolution of plants.
   发现来自共祖树化石提供了关于植物进化的重要见解。