Environmental Science
A biomass pyramid is important because it illustrates

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

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Environmental Science
Our seasons are caused by:

The length of the daylight hours
The changing distance between the earth and the sun
All of these
Only (b) and (c) are correct
The angle at which sunlight reaches the earth

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