I’m looking for a certain material that can absorb and store infrared light for a long period of time (basically stored for months or even longer) and can also release it after touching the skin. Hopefully that makes sense, it would be used in medical practices.

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

not sure if this what   you'r looking for would be percent composition

the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.