Most pollution has become powerful tool human introduce by means of industry by discharging this substances into water and our environment that courses toxic which is poison and damage the animals and plants because it is harmful to them.
Unfortunately, a significant percentage of these compounds are stable in the environment and enter the food chain. They have harmful effects on humans, like the effect they have on endocrine glands
The pollution of the environment by toxic pollutants constitutes a catastrophe for flora and fauna; terrestrial and aquatic, the harmful effects are irreversible and depend on the dose and also on the duration of exposure; the link of our published review on the toxicity of heavy metals for marine and freshwater fish :
https://ejournals.epublishing.ekt.gr/index.php/jhvms/article/view/25407/23353