脊索动物类

例句：

1. 1. The classification of animals into different groups is an important part of biology.
   将动物分类为不同的组是生物学的一个重要部分。
2. 2. Many species of fish are found in the ocean, including sharks and rays.
   许多鱼类生活在海洋中，包括鲨鱼和鳐鱼。
3. 3. The study of vertebrates has led to many discoveries about evolution.
   对脊椎动物的研究导致了关于进化的许多发现。