There are many finger-like projections called
on the inner wall of the small intestine. they increase the for the absorption of food substances.

1st blank-- villi

2nd blank-- surface area

hope it helps u dude(^^)

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