The greatest threat to global biodiversity is

Options :
  1. the introduction of alien species
  2. habitat destruction
  3. over consumption of rice, corn and wheat
  4. the spread of viral diseases throughout the world

Answer and Explanation :-

Answer: Option 2


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It is a disaster that wisdom forbids you to be satisfied with yourself and always sends you away dissatisfied and fearful, whereas stubbornness and foolhardiness fill their hosts with joy and assurance.
-Michel de Montaigne The Complete Essays