Environmental Science
The pyramid of number of a parasitic food chain in forest ecosystem is

always upright
mixture of inverted and upright
sometimes inverted and sometimes upright
always inverted

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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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