✔ 最佳答案
Scientists estimate there are now on Earth more than 1.5 million kinds of biological species (including plants and animals), some studies estimate that the number 20 times higher. But on Earth there are now more than 1,000 kinds of animals endangered species. In the United States alone there are more than 200 kinds of endangered species, including a third of the fish, two-thirds of the small lobster and mussels nearly three-quarters of the animals.
Now a lot of terminology is used to describe biological species close to the situation, but many people do not quite understand or misunderstood the meaning and they respectively.