Owls live in a symbiotic relationship with farmers. Farmers provide barns and a form of shelter for the owls. Owls help control the rodent population around the farm. What is the prey in the owl's predatory relationship?

A) mice
B) frogs
C) insects
D) small birds

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.