What causes a glacier to grow or recede

What enzyme is most important for dna replication and why?

When listening the levels of orginization in orginisims from the smallest to most complex , which level is just below organs in complexity

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.