Which of the following is always a component of allergies?
Out of all the answers shown above the one that best represents the one that is always a component of allergies is answer choice A) histamine.
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According to the Red Cross, people who have tattoos can donate blood. It's just that they would have to wait for 5 or 6 months after getting a tattoo before donating their blood. Same thing if you get your ears pierced.
Answer: Those parts is were all the oxygen is distributed through the human body, and so technically it can be considered the respiratory system.
