6. A gas tax imposed by some states in which those who use the roads more pay more to maintain them is based on the O ability to pay
O efficiency
O benefits received
Osimplicity

as resources become scarce because of population growth, the growth decreases after few years due to lack of resources and food.

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,