Lactase is an enzyme that is produced in the lining of the intestines. this enzyme the body speed up the breakdown of carbohydrates that are found in dairy products, such as milk, yogurt, and cheese. which general function does lactase perform? fighting disease creating movement regulating cell processes sending chemical messages

The general function that lactase does (as given in the choices you provided above) would be regulating cell processes. Lactase is one of the proteins in the body that help metabolize or break down lactose into simple sugars in order for it to be digested properly. If lactase is not produced, you become lactose intolerant. 

a chair, a bed, and a toothbrush

explanation:

it would affect precipitation by causing flooding in some areas of the world due to climate increasing, causing the glaciers in the northern and southern pole of our planet to melt.

i wish you would have provided choices to simplify it and allow me to give an exact answer.