failing kidneys have a harder time excreting phosphate, and thus blood-phosphate levels tend to rise. what effect will rising blood-phosphate levels have on blood calcium

blood calcium levels fall in response to hperphosphatemia

Explanation:

Calcium is bound by the excess phosphate, and the calcium phosphate deposited around organs and in arteries (calcification).

meiosis is the first to occur after the nuclei of opposite of opposite mating types fuse

yes, because even though a theory has a  lot of evidence to support it, it is not always true