The scientists who explained that the greenhouse effect and the Earth's atmosphere function in a similar way were ...... .

What are the major causes of water pollution? Explain.

Surface water contains

The statements that are $TRUE$:
$A$. Methane leads to both global warming and photochemical smog.
$B$. Methane is generated from paddy fields.
$C$. Methane is a stronger global warming gas than $CO_2$.
$D$. Methane is a part of reducing smog.
Choose the most appropriate answer from the options given below:

$A$ water sample is reported to be highly polluted if the $BOD$ (Biological Oxygen Demand) value of the sample becomes:

Detergents and fertilizers containing phosphate compounds are responsible for