Environmental Science
A biomass pyramid is important because it illustrates

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

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Environmental Science
Frost forms when:

All of these
Water vapor changes into ice without first becoming a liquid.
The dew point is 32oF or below.
Objects on the ground cool below the dew point temperature.

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