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:

Absolute humidity
Mixing ratio
Dew point
Relative humidity

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Environmental Science
Which of the following is false?

The succession that occurs in newly cooled lava is called primary succession
Rate of succession is faster in secondary succession
Phytoplanktons are the pioneers in the aquatic ecosystem
Quantity of biomass in a trophic level at a particular period is called as standing crop
The energy content in a trophic level is determined is determined by considering a few individuals of a species in that trophic level.

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