Environmental Science
A biomass pyramid is important because it illustrates

How energy flows through a food web
The number of tropic levels in a system
The biomass of all organisms at each tropic level in a system
The number of species in each tropic level

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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
Saturation vapor pressure decreases with increasing altitude
Water boils at a higher temperature with higher altitude
The temperature of the boiling water decreases with increasing altitude

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