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viruses are known to cause cancer in animals at present, human cancer is not believed to be contagious (传染的) there are many known causes for the transformation of a normal cell to a cancer cell results of experiments on plants and animals do not vary greatly from species tn species
large animal were vulnerable to the changing environment small species survived as large animals disappeared large sea animals may face the same threat today slow - growing fish outlive fast - growing ones
died away died out died off died up
misleading embarrassing boring demanding
they were warm-blooded animals living in cold places. they were warm-blooded animals living in warm places. they were cold-blooded animals living in cold places. they were cold-blooded animals living in warm places.
died away died out died down died of
to; endangered; including of; dangerous; including to; endangered; included of; dangerous; included
Human beings are not aware of the importance of preserving endangered species. Some endangered species have already reached the end of their life span in evolution. The development of human society has greatly affected natural ecology systems. The world’s climate has changed greatly that most species cannot survive.
viruses are known to cause cancer in animals at present, human cancer is not believed to be contagious (传染的) there are many known causes for the transformation of a normal cell to a cancer cell results of experiments on plants and animals do not vary greatly from species tn species
misleading embarrassing boring demanding
viruses are known to cause cancer in animals at present, human cancer is not believed to be contagious (传染的) there are many known causes for the transformation of a normal cell to a cancer cell results of experiments on plants and animals do not vary greatly from species tn species
viruses are known to cause cancer in animals at present, human cancer is not believed to be contagious(传染的) there are many known causes for the transformation of a normal cell to a cancer cell results of experiments on plants and animals do not vary greatly from species to species
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