Class VII

By conserving environment there could be achievement of
  1. sustainable development
  2. dynamic equilibrium in environment
  3. maintained ecosystem
  4. conserved energy resources
Introduction of foreign specie will upset dynamic equilibrium of
  1. water
  2. air
  3. ecosystem
  4. climate
In incineration plants not recycled waste is
  1. burned
  2. filter
  3. reduced
  4. discharged
Calophyllum tree in Sarawak has ability to treat
  1. blood cancer
  2. AIDS
  3. Hepatitis
  4. polio
Island of Mauritius have a bird once called
  1. dodo
  2. duckbill
  3. ostrich
  4. hen
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