Which best describes organisms of the precambrian era? a. land plants and animals b. dinosaurs and primitive mammals c. single-celled organisms and soft, boneless animals d. ferns and flying reptiles

the answer you are looking for is the united states forest service.

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the correct answer is anaphylaxis.

anaphylaxis is a condition caused by insect bites, foods, medications, manifested by tongue swelling, shortness of breath, vomiting, low blood pressure. it sometimes may occur without an obvious reason. it is treated with epinephrine injection.other tretments include antihistamines and steroids,