Environmental Science
The species of plants that play a vital role in controlling the relative abundance of other species in a community are called

Keystone species
Link species
Successional species
Edge species
Pioneer species

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Environmental Science
The wind direction is:

Always directly from low toward high pressure
The direction to which the wind is blowing
The direction from which the wind is blowing
Always directly from high toward low pressure

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Environmental Science
The main reason why vegetables take longer to cook in boiling water at high altitudes is because:

There is less oxygen in the air at high altitude
The temperature of the boiling water decreases with increasing altitude
Saturation vapor pressure decreases with increasing altitude
Water boils at a higher temperature with higher altitude

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Environmental Science
The earth's radiative equilibrium temperature is:

The temperature at which rates of evaporation and condensation on the earth are in balance
The average temperature the earth must maintain to prevent the oceans from freezing solid
The temperature at which the earth is absorbing solar radiation and emitting infrared radiation at equal rates
The temperature at which the earth is radiating energy at maximum intensity

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