As they pass through small blood vessels, erythrocytes may pack together, single-file, like a roll of coins; this formation is called .

thinking it would be physical characteristics

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,