#1 The animal species in turn [note singular "turn"]Choose the most suitable word:
The members of a living community exist together in a particular,balanced relationship or ecosystem.One animal species eats another animal species which 1.(in turns,by turns,therefore,thereafter) eats another.Over years, a balance is worked 2.(at,out,up,on) among the plants and animals which remains basically stable.It's like a huge puzzle with all the pieces in their proper places.3.(Anyway,However,Consequently,For example), at times this balance in nature is disturbed,resulting in possibly unforseen effects. Perhaps a disease results in the near 4.(disintegration,extermination,extinction,disappe arance) of one species ,leaving another species with no natural control. Sometimes,however,human beings 5.(interrupt,intervene,interact,intersect) in a natural environment, perhaps with good intentions, 6.(despite,although,but,so as) the result is the same. 7.(In addition,Moreover,By contrast,For example), this occured in the Antilles in the 1870s.Sugar cane was a major crop there, but rats were eating it causing a great deal of damage.The mongoose, a mammal of the East Indies,was 8.(famous,reported,known,conceived) to be an excellent rat hunter.Several males and females were imported in 1872, and laws were established that forbade the killing of them or their offspring.After 10 years, it had multiplied abundantly, reducing the rat population. Consequently, damage to sugar cane was greatly reduced.The influence of the mongoose,however, did not stop there. As the rat population decreased, the mongoose 9.(wanted,needed,claimed,threatened) to enlarge its menu and became a terible pest.All of the 10.(indigenous,ingenious,ingenuous,innate) animals suffered. Now,it was specifically these animals that kept the local insect population in check.
My answers:1-thereafter;2-out;3-However;4-extinction;5-intervene;6-but;7-For example;8-conceived;9-needed;10-indigenous
#8 This fact was know about the mongoose.
#9 I would prefer threatened - though needed is passable.
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