Environmental Science
In recycling of mineral elements within an ecosystem, the responsible direct acing organism are called

Secondary consumers
Producers
Primary consumers
Decomposers

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Environmental Science
The earth's radiative equilibrium temperature is:

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 rates of evaporation and condensation on the earth are in balance
The temperature at which the earth is radiating energy at maximum intensity

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