The first one is D hope it helps!
Bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
Wow thats pretty hard its asking how many is in each of those
Water combines with carbon dioxide to produce slightly acidic groundwater
that dissolves limestone and forms caves.
This is because the reaction between water and carbondioxide to form
bicarbonate ions( HCO₃⁻). The bicarbonate ions dissociate into Hydrogen
atoms thereby increasing the acidity.
The acidic environment results in the formation of acidic groundwater that
dissolves limestone and forms caves.
Read more on brainly.com/question/25385913
