Without the water cycle, all organisms would die ? true or false

Secondary succession would most likely be taking place in a(n)

Are the earth's ocean floor and continents the same age geologically? why or why not?

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.