With reference to Heavy Metal, consider the following statements: 1.Due to their inert nature they do not bioaccumulate in animal bodies. 2.Heavy metal pollution is due to anthropogenic activity only. 3.Some heavy metals are necessary for life. 4.They cannot be broken down and are nonbiodegradable. Which of the statements given above are correct?

[A] 1 and 2 only

[B] 2, 3 and 4 only

[C] 3 and 4 only

[D] 1, 2, 3, and 4

Answer: C

Notes:

Statement 1 is incorrect- When the heavy metals are swallowed or inhaled into our bodies, they bioaccumulate in our system. This bioaccumulation causes biological and physiological complications.
Statement 2 is incorrect– Natural causes can also increase heavy metal pollution such as volcanic activity, metal corrosion, soil erosion, geological weathering, etc.
Statement 3 is correct- Some heavy metals are necessary for life and are called essential elements which are required for a variety of biochemical and physiological functions.
Statement 4 is correct- They cannot undergo microbial or chemical degradation so are non-degradable.