15. Desertification is caused by a combination of converging problems, including: A. overgrazing, deforestation, drought, and climate change. B. contamination of irrigation water and natural cycles. C. urban sprawl, pesticide contamination, and natural cycles. O D. famine, starvation, and biodiversity loss.​

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,