Upon close examination of the skeleton of an adult python (a type of snake), a pelvic girdle (hip bones) and leg bones can be observed. These features are an example of... Question 6 options: artificial selection comparative biochemistry vestigial structures comparative embryology

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.