Other introduced species have proved similarly _ among native Australian animals.
disastrous
15
Since the introduction of the cat, the fox and the rabbit from Europe, 19 species of native animals have become _ and a further 250 species are considered to be either endangered or vulnerable.
extinct
15
The mountain gorilla is on the verge of _.
extinction
20
Since the introduction of the cat, the fox and the rabbit from Europe, 19 species of native animals have become extinct and a further 250 species are considered to be either _ or vulnerable.
endangered
20
Since the introduction of the cat, the fox and the rabbit from Europe, 19 species of native animals have become extinct and a further 250 species are considered to be either endangered or _.
vulnerable
20
The _ approach to the biological control of pests is through genetically modified crops.
modern-day
15
The modern-day approach to the biological control of pests is through _ modified crops.
genetically
15
There are about 4 000 inherited human _ diseases.
genetic
15
The modern-day approach to the biological control of pests is through genetically _ crops.
modified
15
It _ _ _ _ whether this controversial method will have any long-term repercussions, particularly in regards to the ecological balance of the environment where they are grown.
remains to be seen
25
It remains to be seen whether this controversial method will have any _ repercussions, particularly in regards to the ecological balance of the environment where they are grown.
long-term
15
It remains to be seen whether this controversial method will have any long-term _, particularly in regards to the ecological balance of the environment where they are grown.
repercussions
20
It remains to be seen whether this controversial method will have any long-term repercussions, particularly in regards to the _ _ of the environment where they are grown.
ecological balance
25
Some fear that insects may become _ to these new crops and therefore become even more difficult to control.
