What are the primary effects of calcitriol on the body? check all that apply?

The primary effect of calcitriol on the body is to INCREASE BLOOD CONCENTRATION OF CALCIUM.
The primary function of calcitrol is to increase the amount of calcium that are in the blood. It accomplishes this through various mechanisms.
Calcitriol also stimulates the release of calcium and phosphorus from bone and increases the re absorption of calcium from the kidneys. 

Except hold on to his or her beliefs even if there is no evidence for those beliefs.

Cbecause it is the only one describing a habitat