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

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

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Environmental Science
Which of the following regarding ecological pyramids is not correct?

In tree dominated ecosystem the pyramid of numbers is inverted
In deep water ecosystem, the pyramid of biomass is upright
The pyramid of energy expresses mainly the rate of food production
In most ecosystems, the pyramid of numbers and biomass are up right
The total energy flow at successive tropical level always decreases

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