Environmental Science
The most important human activity, leading to the extinction of wildlife, is

Hunting for valuable wildlife products
Alternation and destruction of the natural habitats
Introduction of alien species
Pollution of wildlife, is

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Environmental Science
Lead poisoning

reduces O2 carrying capacity of hemoglobin in blood
increases O2 carrying capacity of hemoglobin in blood
reduces O2 carrying capacity of myoglobin in muscles
increases O2 carrying capacity of myoglobin in muscles

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