<span>b. They release oxygen that organisms use to breathe.</span>
The correct answer is letter A. Pain receptor - tissue injury. Nociception refers to the processing of harmful stimuli in the nervous system. The nociceptors are also known as "Pain receptor" that responds only to tissue damages cause by either mechanical, thermal stimulation.
Answer:
Explanation:Fever* or feeling feverish/chills.
Cough.
Sore throat.
Runny or stuffy nose.
Muscle or body aches.
Headaches.
Fatigue (tiredness)
Some people may have vomiting and diarrhea, though this is more common in children than adults.
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