What is released at each level of a pyramid of energy

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halogen, any of the six nonmetallic elements that constitute group 17 (group viia) of the periodic table. the halogen elements are fluorine (f), chlorine (cl), bromine (br), iodine (i), astatine (at), and tennessine (ts).

b

explanation:

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