Environmental Science
The density of water vapour in a given parcel of air is expressed by the:

Specific humidity
Absolute humidity
Mixing ratio
Relative humidity
Saturation vapor pressure

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Environmental Science
A food web is

Like a food chain
The tropic (feeding) levels that can be observed in an ecosystem
A set of interconnected food chains, illustrating the tropic relationships among species
The set of prey species that are consumed by animals in an ecosystem

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