“a specific reaction of the immune system to a foreign and frequently harmless substance” is an a. inhaler. b. arthritis. c. allergy. d. asthma.

Answer in a couple of paragraphs, 1 or 2 at the most if anything! 20 points + brainliest--> explain what all the systems in your body do to work together < --list of systems needed: circulatory systemrespiratory systemdigestive systemexcretory systemnervous system