Why does the addition of CO2 ( a substrate that maces CaCO3) actually cause LESS CaCO3 to be made, and actually dissolved?

Which of the following is an oxidation-reduction reaction? (pictured below)

Which excerpt from the land, part 4 best supports the claim that paul is a talented horseback rider? a/“figure that says more than anything else! now, i want to ride that stallion! " b/my daddy shook his head. "paul only rides horses he knows. ” c/? i glanced over at the other rider. the fellow was older than i, and had the weight of a man on him. d/a man out of alabama, man name of ray sutcliffe, told my daddy i was such a good rider, he wanted me to ride some races for him.

Me with these questions image attached