Environmental Science
Which one of the following ecosystem type has the highest annual net primary productivity?

Tropical rain forest
Tropical deciduous forest
Temperate evergreen forest
Temperate deciduous forest

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Environmental Science
The aurora is produced by:

Burning oxygen caused by the intense sunlight at high altitude
Reflections of sunlight by polar ice fields
The combination of molecular and atomic oxygen to form ozone
Fast-moving charged particles colliding with air molecules
Scattering of sunlight in the upper atmosphere

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