1. The internal reasons for the endangerment and extinction of some species in China are () A. Species specialization or loss of functional genes B. Arbitrary hunting C. Habitat destruction and loss D. Alien species invasion analysis: choose A. According to the information "intrinsic reason" in the stem, the answer is A, and the other three options are external causes. 2. (2012? Suzhou Senior High School Test) The following table shows the main causes and proportions of mammals and birds that are threatened in a certain place. % 60% Biological invasion 17% 12% Other reasons 20% 8% A. Biological invasion can increase the diversity of organisms and help maintain a stable ecological environment The main reason for the threat of bird survival is the loss of habitat by human activities. The main reason for the survival of mammals is poaching D. The place must be grassland
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