What do you mean by biomagnification of harmful chemicals ? How does this phenomenon affect the human health ?

Explanation

Biomagnification of harmful chemicals.
Harmful chemicals enter through the soil and water in the first trophic level of the food chain and then their concentration goes on increasing in the second trophic level to the last trophic level.
This incrasing concentration of toxic substances within each successive trophic level in the food chain is known as biomagnification of harmful chemicals. Human being is at the last trophic level of its food chain. So harmful chemicals enter into humans bodies in maximum quantity and thus damage our internal body organs and cause many types of diseases in our body.