物种

例句：

1. 1. The study of species helps us understandthe diversity of life on Earth.
   研究物种有助于我们了解地球上生命的多样性。
2. 2. Different speciesof birds have different songs and behaviors.
   不同种类的鸟有不同的歌声和行为。
3. 3.Species are classified based on theirphysical characteristics and genetic differences.
   物种是根据它们的物理特征和遗传差异进行分类的。