Friction reduces efficiency because energy is lost as . a.
work
c.
gravity
b.
heat
d.
thrust

Please select the best answer from the choices provided

A
B
C
D

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.