I think it is Sulfur Dioxide (SO2) and Nitrogen Oxides (NOX).
Found at the lowest point of a large drainage area, these seasonal, marsh-like ponds collect and store water from rain and runoff. Unlike vernal pools, playas generally fill when temperatures are unsuitable for plant growth, and often the water is salty, alkali or both.
source- google
The answer is A
i did the test and i got it right
Transform/conservative plate boundary.
hope it helps c:
This is called species richness
