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
Frost forms when:

Objects on the ground cool below the dew point temperature.
All of these
The dew point is 32oF or below.
Water vapor changes into ice without first becoming a liquid.

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