The main reason for the current decline in global biodiversity is wildlife

First, the loss and fragmentation of biological habitats, the reclamation and expansion of land by humans, the area of undisturbed natural habitats has been drastically reduced and fragmented, and environmental pollution and climate change have also caused the disappearance of species.

the second is desertification, which accounts for 30% of the world's land area and is still expanding;

Third, over-exploitation and consumption, a large number of wildlife resources have been over-exploited and utilized, resulting in a serious decline in biodiversity;

Fourth, biological invasion, the invasion of alien species has caused the living environment of many local species to deteriorate, changed the composition of the ecosystem, and caused the loss and even extinction of some species in the local area;

The main reason for the decrease in biopolycircular lettering is frankly known.

1: The reason for the rapid increase in the number of people in orange dress.

2: Habitat fragmentation Causes.

3: Environmental pollution causes.

You remember: this is just the case, we can't do without pesticides, fertilizers, genetically modified organisms, etc., because they allow more people to survive, which is bound to destroy the ecological balance, so the loss of biodiversity is inevitable, and the same is true of the principle of species evolution. China is facing many challenges, and the protection countermeasure is to improve the quality of the people and establish more nature reserves.

China is one of the countries with particularly rich biodiversity. According to statistics, China's biodiversity ranks eighth in the world and first in the northern hemisphere. At the same time, China is one of the countries with the most serious threats to biodiversity.

China's primary forests have been affected by human activities such as indiscriminate deforestation and deforestation for a long time, and their area has been decreasing at a rate of 0 5 104 km2 per year. Due to the impact of overgrazing and grassland destruction, the grassland has been degraded to 87 104 km2. The widespread destruction and degradation of ecosystems is not only manifested in the reduction of the total area, but more seriously, in the reduction or loss of their structure and function, which has made many of the species that live in them endangered or threatened. There are 4000-5000 species of higher plants threatened, accounting for 15-20 of the total species.

Among the 640 endangered species listed in the International Convention on Endangered Species of Wild Fauna and Flora, China accounts for 156 species, about 1 4 of the total, and the situation is very serious.

As early as 1992, China participated in the United Nations Conference on Environment and Development held in Brazil and signed the Convention. Subsequently, China** ratified the Convention and fulfilled its commitments. A national working group on the implementation of the Convention has been set up under the Environment Committee to coordinate the implementation of the Convention in China.

In 1994 and 1997, respectively, the Action Plan for Biodiversity Conservation of China and the Report on the National Conditions of Biodiversity of China were completed and officially released. At the same time, the construction of laws and regulations for species protection and nature conservation has been strengthened, and projects related to biodiversity conservation such as natural forest protection projects have been launched one after another. It has laid a good foundation for biodiversity conservation in China.

** Determination and measures are very important. However, it is not enough to have the best efforts, and the people of the whole country must mobilize and work together to protect China's biodiversity and achieve sustainable social and economic development.

The way of nature is to be followed, and survival is also necessary to sacrifice something, which is the result of competition!

The greatest impact on biodiversity loss is ().

a.raw or cautious invasion.

b.The use of natural populations.

c.Global climate change.

d.Land use and cover change.

Correct spine answer: d

1. Environmental pollution, due to the widespread use of pesticides, rat poison, chemical fertilizers, coal, and oil, has produced a large number of industrial "three wastes" and toxic substances, which have seriously polluted the atmosphere, soil, and water bodies.

2. Habitat destruction, human deforestation, land reclamation by lakes and seas, overgrazing, etc., directly caused the loss of wildlife habitats, and indirectly led to the endangerment of wild animals.

3 Indiscriminate hunting, which is a direct cause of the endangerment of many species. Turtles, snakes, falcons, Tibetan antelopes, ornamental birds and frogs are the most heavily hunted animals.

4 Natural disasters, natural disasters are also one of the causes of endangerment of species. For example, in 1998, a rare flood in the Yangtze River basin wiped out many wild animals that inhabit plain or hilly areas.

5 Species-specific causes, species specialization and genetic exhaustion, are often intrinsic causes of endangerment or even extinction. In the long-term evolutionary process, some species of wild animals have adapted to a specific habitat environment and developed special habits (including feeding habits), making it difficult for them to adapt to the changed environment or other environments, and eventually settle down"Those who are not fit are eliminated"The ending.

The wolves are dying. It is reported that there are only about 2,000 Mongolian wolves left in China. What do you say cannot be extinct!! Sooner or later, it will be the turn of humanity.

First, the loss and fragmentation of biological habitats, the reclamation and expansion of land by human beings, the area of undisturbed natural habitats has been drastically reduced and fragmented, and environmental pollution and climate change have also caused the disappearance of species;

the second is desertification, which accounts for 30% of the world's land area and is still expanding;

Third, over-exploitation and consumption, a large number of wildlife resources have been over-exploited and utilized, resulting in a serious decline in biodiversity;

Fourth, biological invasion, the invasion of alien species has caused the living environment of many local species to deteriorate, changed the composition of the ecosystem, and caused the loss or even extinction of some species in the local area;

Physical human factors: such as radiation contamination.

Anthropogenic factors in chemistry: For example, the pollution of water and soil by toxic heavy metals leads to a decrease in biodiversity.

Anthropogenic factors: Intentional or unintentional invasions of alien species cause serious damage to native biodiversity.

Human factors of mechanical destruction: such as the reduction of vegetation species due to indiscriminate logging, indiscriminate land reclamation, etc.

Not rigorous enough, please advise.

The diversity of biological species refers to the richness of biological clocks (including animals, plants, and microorganisms) in a certain area, such as the species that have been identified by humans, there are about more than 1.7 million pure volts, and there are 1244 species of birds known in China, that is, biodiversity and its changes at the species level

Gene diversity refers to the genetic changes within the individual or population of the species, the genetic composition of different species is very different, the traits of the living only thing are determined by genes, the traits of organisms are very different, indicating that the genes of the constituent organisms are also thousands, and the genes of the same species such as birds (there are white, black, gray, etc.) genes are also different, and each species is a unique gene pool

Genetic diversity determines the diversity of species of organisms Between 1800 and 1950, 378 species of birds were extinct in the world, so a decrease in the diversity of species leads directly to a decrease in genetic diversity

Therefore, a