Environmental Science
Frost forms when:

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

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Environmental Science
What is meant by ex-situ conservation?

Conservation of forest eco system
Conservation of a species outside its natural habitat
Conservation of plants
Conservation of a species by protecting its habitat along with all other species living there

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