A sea arch forms when waves erode a layer of softer rock that under- lies a layer of harder rock. If an arch collapses, the result might be a sea stack, a pillar of rock rising above the water.
Another name for folic acid is folacin and this is required for cells to produce a metabolite caled formate which is involved in the synthesis of nucleotides. The enzyme involved in its absorption/conversion is dihydrofolate synthetase and not folacin.
