3. The absorptive effectiveness of the small intestine is enhanced by increasing the surface area by
A villi.
C. digestive juices
B. enzymes.
D. elasticity of intestine,​

A villi.

Explanation:

Small intestines have finger-like extensions that basically increase the surface area for nutrients to attach and get transported inside the bloodstream or cells.

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

ya the other dude is right