Hamza holds hands close to a hot surface. he can feel the infrared waves but cannot see them. what explains hamza’s observations

Radiation

Explanation:

Hamza is observing radiation. Well, of course, the safe kind. Radiation is the release of energy in the form of electromagnetic waves or active subatomic particles. In this case, Hamza is observing heat radiation, which cannot harm him, as compared to UV or Gamma radiation.

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

thinking it would be d not too sure but i think it's right