29. Bulk tanks that are used to store raw milk should have what mechanical component to assure thorough mixing of the milk to prevent fat separation? A. thermometer B. agitator C. air vent D. automated control box

## Step 1<br />The problem is asking us to identify the mechanical component that is necessary in bulk tanks used for storing raw milk to ensure thorough mixing of the milk and prevent fat separation. The options provided are thermometer, agitator, air vent, and automated control box.<br /><br />## Step 2<br />Let's analyze each option:<br />- A thermometer is used to measure the temperature of the milk, not to mix it.<br />- An air vent is used to release excess air pressure, not to mix the milk.<br />- An automated control box is used to control the temperature and other parameters of the tank, not to mix the milk.<br /><br />## Step 3<br />An agitator, on the other hand, is a mechanical device used to mix or stir the contents of the tank. In the context of milk storage, an agitator would be used to ensure that the milk is thoroughly mixed, preventing the separation of fat.