What is the definition of population?

a: a living community plus the nonliving variables that affect it

b: all the members of one species in a given time and place

c: an individual that belongs to a larger community

d: an assemblage of different species that live in the same geographical area

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.