Apterygota

例句：

1. 1.Apterygota is a group of animals that lack backbones and have no internal skeleton.
   无脊椎动物是一类没有脊柱且内部没有骨骼的动物。
2. 2. The discovery of Apterygota has led to the study of evolution.
   对无脊椎动物的发现推动了进化论的研究。
3. 3. Insects are a type of Apterygota, which means they lack backbones.
   昆虫是一种无脊椎动物，这意味着它们没有脊柱。