作业帮为什么北极和澳大利亚没有兔子
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为什么北极和澳大利亚没有兔子
为什么北极和澳大利亚没有兔子
为什么北极和澳大利亚没有兔子
澳大利亚有很多兔子.曾经泛滥成灾,科学家们用一种病菌控制兔子的数量,才不至于吧地里的庄稼全都吃光.
Since their introduction from Europe in 1859,the effect of rabbits on the ecology of Australia has been devastating.Rabbits are suspected of being the most significant known factor in species loss in Australia.The loss of plant species is unknown at this time.Rabbits often kill young trees in orchards,forests and on properties by ringbarking them.[1]
Rabbits are also responsible for serious erosion problems as they eat native plants,leaving the topsoil exposed and vulnerable to sheet,gully and wind erosion.The removal of this topsoil is devastating to the land as it takes many hundreds of years to regenerate.