Environmental Science
The ratio of the mass of water vapour in a given volume (parcel) of air to the mass of the remaining dry air describes the:

Mixing ratio
Relative humidity
Dew point
Absolute humidity

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Environmental Science
What is meant by ex-situ conservation?

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

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