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

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

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Environmental Science
The lag in daily temperature refers to the time lag between the:

Sunrise and sunset
Time of minimum temperature and the time of maximum solar radiation
Minimum and maximum temperature for a day
Minimum and maximum solar energy received at the surface for a given day
Time of maximum solar radiation and the time of maximum temperature

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