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13 questions from this quiz
Variety of living organisms in ecosystem
Waste, food, chemicals & antibiotics leak
High densities of fish in enclosures
Large protein needs deplete wild stocks
Compete with indigenous species
Species not naturally in an area
To control pests on sugar cane crops
Cane toads are toxic to many animals
No natural predators in new habitat
Overuse of fertilisers in agriculture
Block sunlight stopping photosynthesis
Bacteria decomposing dead plants use O2O_2O2
Replanting hedgerows and woodlands
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