China is one of the countries with the most abundant biological species in the world, and higher plant and wild animal species account for about 10% of the world. However, environmental pollution and ecological damage have caused damage to the living environment of animals and plants, and the number of species has decreased sharply. Some species Extinct. According to statistics, about 200 species of higher plants have become extinct in the past 50 years, and an average of 4 species are extinct each year; about 400 species of wild animals are in an endangered or threatened state. The text is intended to explain:. ['The rate of extinction of animals and plants is increasing year by year.', 'Endangered animals or plants due to environmental degradation.', "China's animal and plant species are relatively abundant.", 'Higher plants need more protection than wild animals.']