species odor

例句：

1. 1.The scientists are studying the behavior of different species of birds.
   科学家们正在研究不同种类的鸟类的行为。
2. 2. The diversity of life on Earth is due to the existence of countless species of plants and animals.
   地球上生命的多样性归功于无数植物和动物的存在。
3. 3.Species extinction is a major threat to biodiversity.
   物种灭绝是生物多样性的一大威胁。