The major function of the respiratory system is to:
A. maintain the digestive system of the body so that it can continue to operate.
OB. give the heart the energy it needs to circulate blood.
O c.
provide oxygen to the body and eliminate carbon dioxide from the body.
OD. cleanse the body of toxins, poisons, and harmful chemicals.
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provide the organism with the gases the cells need.

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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.