生物入侵者（Biological invaders）.docVIP

生物入侵者（Biological invaders） This article is contributed by gengxm5567 Ppt documents may experience poor browsing on the WAP side. It is recommended that you first select TXT, or download the source file to the local view. Read the first paragraph, read the first paragraph, what is what is said biological invaders ? Invader We understand the biological invasion, we understand the characteristics of the who, who can give it a definition? Next definition? Originally living in a foreign country, originally living in a foreign country, through the unnatural way to migrate to the new ecological environment, ecological environment, and to the local ecosystem and human society caused very much A creature of great danger is called birth An intruder; an invader 4, reasons and ways - non natural ways, non natural ways,,- Distinguish: the following creatures belong to the biological invaders. Are the following creatures belonging to the biological invaders? Why? Why? 1, a dandelion seeds may drift with the wind after a few kilometers to the ground, and in there, a dandelion seeds may drift with the wind dozens of kilometers after landing, take root, germination, growth. Take root, sprout, grow. 2, the mountain streams in fish with water may swim to settle down the river. In 3 and 1988, several originally built on the continent of Europe had been brought to the North American continent by a cargo vessel, which quickly multiplied and blocked the drain. The North American continent is rapidly growing and clogging the drain. 4, in recent years, originating in South America beautiful but ferocious piranhas to ornamental fish, in recent years, the identity was introduced to some areas and thus bring cholera disease. The identity is introduced into certain areas and thus brings the cholera source. (1) a dandelion seed floats on the wind. It falls to the ground after a few dozen kilometers, and roots there, and lands after a few kilometers. It roots, grows and grows there. Germination a