Which of the following is generally not considered a pollutant?

$A$ disease caused by eating fish contaminated by industrial waste containing mercury compounds is known as

Pesticides disturb the ecosystem by eliminating the

It refers to the amount of oxygen that would be consumed if all the organic matter in one liter of water were oxidized by bacteria.

Which of the following statements are correct regarding Eutrophication?
$I-$ Streams entering into a lake introduce nutrients like nitrogen and phosphorus,which encourage the growth of aquatic organisms.
$II-$ As the lake's fertility increases,plant and animal life flourish.
$III-$ Organic remains begin to deposit at the bottom of the lake.
$IV-$ Organic waste materials continue to accumulate in the lake.
$V -$ The lake becomes shallower and warmer.
$VI -$ Cold-water organisms are replaced by warm-water organisms.
$VII -$ Marsh plants take root in the shallows and begin to fill in the original lake basin.

The soil pollutants that affect the food chain and food web by killing microorganisms and plants are