Environmental Science
Many freshwater animals cannot live for long in sea water and vice versa mainly because of the

Change in N levels
Change in the levels of thermal tolerance
Variations in light intensity
Spectral quality of solar radiation
Osmotic problems

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Environmental Science
At night, low clouds:

Weaken the atmospheric greenhouse effect
Enhance the atmospheric greenhouse effect
Have no effect on the atmospheric greenhouse effect
Are often caused by the atmospheric greenhouse effect

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