Natural pollution includes smog. Smog is a combination of smoke in an air and fogs.
When you say natural pollution, it is not being caused by human rather caused by a natural resources or organism.
Falling leaves are natural, but its not a pollution.
<span>Renal clients need to avoid salt substitutes because they often contain Potassium. Many people with kidney problems are unable to rid their bodies of excessive potassium which may at times lead to cardiac arrest. Patients should experiment salt-free herbs and flavours in their diet.</span>
A is the right answer because it is.
