The purpose of pre-cleaning the dental operatory is to.. a) separate contaminated and uncontaminated waste. b) reduce the number of ­contaminated items in the treatment area. c) prevent debris, saliva, and blood from drying on instruments.

B.

All dentist equipment is used in the mouth. Many deseases, bacteria and viruses are transmitted trough saliva, and not all of these are weak. So, that is why we clean the dental operatory, to lower the chances of transmitting anything.

Hope it helped,

BioTeacher101

rain is the best answer

rising temperatures because when water vapor in the air is cooled, it condenses. it turns back into a liquid and attaches to dust particles in the air. these very small water droplets group together to form clouds