The location that is marked x is when
<span>changes occur gradually begins when lichens populate an area results in a reduction of the number of species
.</span>
I would have to say the answer is C.
A is incorrect since hydrogen is not an air pollutant.
B is incorrect because ozone is most definitely one of the top.
And D has cyanide which is a chemical for suicide during wars.
Hope this helps!
Answer:
Areas of health you can choose: food/nutrition, physical/excercise, etc
Sorry if this doesnt help much
Explanation:
