Lactase is a protein in the digestive tract that break down certain sugars found in milk. what is the main function of lactase?

Lactase protein acts as a digestive enzyme whose main function is to break down the lactose sugar. Lactose is found in milk and other dairy products.  Lactose sugar is a big molecule and thus it is difficult to metabolize it. Lactase breaks down the lactose into smaller molecules such as glucose and galactose, which are easily absorbed by the intestine.

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds

to figure the total magnification of an image that you are viewing through the microscope is really quite simple. to get the total magnification take the power of the objective (4x, 10x, 40x) and multiply by the power of the eyepiece, (usually 10x)