This is a solid substance that is composed of minerals.

The answer is rock.

Explanation: A rock is a a solid substance in which it is composed of large quantities of one mineral, or contains 2 or more minerals.

answer; ///(b) it is composed of four protein chains and four heme groups;

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.