关于动物实验的英语作文~

Extinction
Extinction is a natural process. Many species had ceased to exist before humans evolved. However, in the last 400 years, the number of animals and plants becoming extinct has reached crisis point. Human population levels have risen dramatically in the same time period and man's predatory instincts combined with his ruthless consumption of natural resources are directly responsible for the situation.
Dodo
The Dodo is a classic example of how human behavior can cause irreparable damage to the earth's biological diversity. The flightless Dodo was native to the Island of Mauritius in the Indian Ocean. It lived off fruit fallen from the island's trees and lived unthreatened until humans arrived in 1505. The docile bird became a source of food for sailors and lacked the ability to protect itself from animals introduced to the island by humans such as pigs, monkeys and rats. The population of Dodos rapidly decreased and the last one was killed in 1681