What is the logical order of biological invaders 5

1. Overall logical order.

The first step is to define "biological invaders", which is a prerequisite for understanding things; Paragraph 2 excludes the "natural pathway migration" of ancient organisms, making the extension of the concept clearer. The second step is to explain the two major hazards of "biological invaders" - the huge economic losses caused to human society and the serious damage to the original ecosystem of a certain area, which is a natural extension of the derogatory term "invader". The third step is to deepen the understanding from the outside to the inside, from the things and people, from nature to society.

The fourth step is to introduce the basic understanding and countermeasures of scholars on "biological invaders", so that the reader's understanding can enter the level of "transforming the world", so that the whole understanding process will reflect logic.

2 Local logical order.

The difference in magnitude is reflected in the phrase "particularly worrying biologists" in paragraph 4, which is the logical basis for arranging the order in which the two hazards are addressed; Paragraph 5 gives examples of the reasons for the increasing prevalence of "biological invaders", starting with "fresh fruits and vegetables" because they are abundant and harmful; The second time is "transnational pets", because this has happened "in recent years", and the number and degree are secondary. This way of arranging the material according to different degrees is a common logical sequential method. At the end of the article, two countermeasures of the United States are introduced, first to strengthen the monitoring of the transportation sector, and then to formulate a cross-departmental monitoring plan, which also reflects the logical order from easy to difficult.

3 The case arrangements are detailed and omitted.

The details of the examples in this article are slightly different, and the example of the settlement of the Palm Tree Snake during World War II is very detailed, because this example is very typical, and most readers do not understand. The "Mediterranean fruit fly" is mentioned in passing, because there was a time when there were reports of the Mediterranean fruit fly full of **, and people knew a lot. It seems that the detailed arrangement of the expository essay should take into account both the characteristics of the object of the explanation and the reader's knowledge background.

These are some "biological migrants" who have crossed mountains and oceans, perhaps a bacterium, a plant or an animal. When they came to a foreign land, they lost the balance of natural enemies and gained a vast living space, grew rapidly, occupied lakes and land, and the "indigenous creatures" withered or even became extinct due to their squeezing. This is called biological invasion.

Biological invasions may be unfamiliar to people, but when it comes to foot-and-mouth disease, mad cow disease, and even AIDS, people are not unfamiliar with them, in fact, these are all types of biological invasions. Some of the animals and plants that people often mentioned in the past are also invasive in some places, such as morning glory, water hyacinth, Mediterranean diving fly, airplane grass, lantana, whitebait, and so on.

There are two types of biological invasions: intentional and unintentional. With the introduction of species, these immigrants may benefit human beings on the one hand, and on the other hand, they may also have a certain impact on the local ecological environment and even economic development. In addition to mad cow disease and foot-and-mouth disease, the disasters brought to human beings by harmful organisms in ancient and modern China and abroad are very painful because pests endanger human health and the safety of agricultural organisms.

In recent years, invasive alien species have caused serious harm to China's biodiversity and ecological environment, and at the same time caused huge economic losses. In order to prevent and control the invasion of alien species, protect biodiversity and ecological environment, ensure national environmental security, and promote sustainable economic and social development, the State Environmental Protection Administration and the Chinese Academy of Sciences jointly announced the "List of the First Batch of Invasive Alien Species in China", with a total of 16 species, namely Eupatorium purpurea, Mikania, hollow lotus seed, ragweed, poison weed, Spartina alterniflora, airplane grass, water hyacinth (water hyacinth), false sorghum, cane flat moth, wetland pine mealybug, strong beetle, American white moth, African giant snail, Fushou snail, and bullfrog.

10. What is the example of the palm tree snake given in the first paragraph? Answer: Explain how "biological invaders" will affect the affected 3 What is the difference between biology and ecology? Answer: Biology: The study of the structure, function, occurrence and occurrence of living things.

Relationships between species, competition, predation, etc.

It should be the next definition, the criteria for defining invasive species:

1) Being introduced into a non-native area through intentional or unintentional human activity.

2) Self-regeneration capacity is formed in local natural or man-made ecosystems.

3) Causing significant damage or impact to the local ecosystem or geographical structure.

Invasive alien species are those species, subspecies or below taxa that occur outside their past or present natural range and dispersal potential (i.e. outside their natural range or without direct or indirect introduction or human care), including all their potentially viable and subsequently reproducing parts, gametes or propagules. Invasive alien species are in an ecosystem where the species does not exist in the first place, and it is brought in by human activities to overcome spatial barriers that cannot be naturally overcome. Under the natural situation of human beings, the barriers of mountains, rivers, oceans, etc., as well as the differences in natural geographical factors such as climate, soil, temperature, and humidity, constitute obstacles to the migration of species, and it is quite difficult to rely on the natural dispersal ability of species to enter a new ecosystem.

While there have been cases where climatic and tectonic changes have introduced animals, plants or pathogens into new systems, more often than not, human activities have led to the migration of more and more species, either intentionally or unintentionally.

The invasion of alien species is inseparable from the mechanism of the establishment, stability and evolution of ecosystems. When an alien species is introduced to a new balanced ecosystem, it may be excluded from the system because it cannot adapt to the new environment, and must rely on human help to survive; It may also be suitable for the local climate and soil conditions, and there are no organisms in the new environment to compete with or restrict, at this time, the alien species becomes a real invader, breaking the ecological balance, changing or destroying the local ecological environment, and becoming an invasive alien species.

Invasive alien species become invasive alien species when they establish populations in natural or semi-natural ecosystems or habitats, altering or threatening native biodiversity.

Characteristics: 1) Strong ecological adaptability; (2) strong reproductive ability; (3) Strong transmission ability.

Ecosystems are formed through long-term evolution, and the species in the system have formed a close relationship of interdependence and mutual restraint after hundreds and thousands of years of competition, exclusion, adaptation and mutual benefit. After an alien species is introduced, it may be excluded from the system because it cannot adapt to the new environment, and must be helped by people to survive; It is also possible that because there are no competing or constraining organisms in the new environment, the introduced species may become a real invader, upsetting the balance and altering or destroying the local ecosystem.

It should be defined. I'm also in my second year of junior high school, and it seems to be in the text.

Definition, because it can also be said to be "what is a biological invader", the form of definition is a is b, b can also be a, and the interpretation is just a is b, in short, the definition can be reversed, but the interpretation can not be understood?

is a species that occurs outside its natural range (past or present) and distribution location (i.e., that it is naturally colonized outside its original range, or cannot be colonized without direct or indirect introduction, or without human activity), including any part, gamete, or propagulum that these species can survive and reproduce.