Environmental Science
The organic matter produced by the photosynthetic activity of green plants is called as

light energy
primary productivity
cellular process
energy flow

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Environmental Science
The main reason why vegetables take longer to cook in boiling water at high altitudes is because:

Water boils at a higher temperature with higher altitude
The temperature of the boiling water decreases with increasing altitude
There is less oxygen in the air at high altitude
Saturation vapor pressure decreases with increasing altitude

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