In the cycle that shapes Earth's surface, which event must happen before erosion can occur?
deposition
settling
transportation
weathering

answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle 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