The one way conduction of blood through the
heart is produced by the: *

the element that provides strength to the exoskeletons of clams and oysters is phosphorus. this is so because calcium carbonate is the main component in the shells.

explanation:

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

the rocks are classified by the geological process they are formed by. the three main groups of rocks are igneous, metamorphic, and sedimentary. minerals are not they are classified under the chemical classes they are in. these groups include silicates, sulfates and carbonates.