To grow, reefs need which of the following? ? to grow, reefs need which of the following? a warm temperatures b constant salinity c plenty of sunshine d all of the above coral reefs are primarily found a north of the tropic of cancer b between the tropic of cancer and the tropic of capricorn c just along the equator d south of

Which of the following best describes the purpose of the parathyroid hormone? a. it decreases the blood calcium level and decreases blood phosphorus level. b. it decreases the blood calcium level and increases the blood phosphorus level. c. it increases the blood calcium level and increases blood phosphorus level. d. it increases the blood calcium level and decreases blood phosphorus level.