
Passage: With the help of DNA preserved in animal fossils and specimens, and using increasingly advanced cloning and genetic technology, humans have been able to "revive" some long-extinct animals, such as mammoths, dodos, dinosaurs and so on. At the same time, there is also a big discussion in the scientific community about whether human beings should resurrect extinct animals. Supporters believe that resurrected animals are expected to restore the damaged ecological environment in some areas. For example, mammoths live on the vast grasslands of Siberia, and their droppings are excellent fertilizers for nourishing the grasslands. After the mammoth became extinct, the prairie lacking fertilizer was gradually replaced by the tundra. If the mammoth can be revived and returned to Siberia, it will help to reduce the area of the tundra and gradually restore the grassland ecosystem.
Question: Which of the followings, if true, can best refute the views of the above supporters?
A. A.If we invest a lot of time, energy and cost to revive the vanished creatures, it is bound to contain and weaken the protection of the existing endangered animals, and the loss outweighs the gain
B. B.Just cloning an individual of an extinct animal does not mean that human beings have the ability to resurrect the whole population
C. C.Even if extinct animals can be resurrected in groups, the habitat suitable for their growth may have disappeared long ago, and all efforts will be in vain if a suitable living environment is not given to the reborn species
D. D.Most of these animals gradually disappeared in the process of human development, and it was human activities that led to their extinction
Answer: