B Steve Jones is an___1___(environment) expert who tries to keep animals and plants from___2___(become) endangered. If we know more about what causes___3___ (danger), we may be able to take measures before it is too late. A species can become ___4___ (endanger) for___5___ (differ) reasons. Animals and plants must have a habitat or home, which is___6___ (comfort) and clean, and where there is enough food and other resources. Otherwise they can not live___7___ (comfortable). They are all used to their environment; that is, they have learnt how to live___8___ (succeed) in their habitat.