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

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

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Environmental Science
Our seasons are caused by:

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

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