2. Nitrifying bacteria convert a. Nitrogen oxide to nitrogen gas
b. Nitrogen to nitrates
c. Ammonium to nitrites
d. Water to nitrogen gas

answer; i believe its echoic memory,it is believed to last three to four seconds; good luck

equal distribution i think.

these muscles maintain the blood pressure in the vessels. the smooth muscles are innervated by nerves of the autonomic nervous system. when the muscles contract, they cause vasoconstriction of the vessels and increase blood pressure. when the muscles relax, they enable vasodilation of the   blood vessels hence reduce blood pressure.