Enviromental stressors i. poverty ii. pollution iii. having an illness iv. natural disasters v. not getting enough sleep vi. parents getting a divorce (which of the items above are not considered environmental stressors?

are there any letter choices to this or is this an open ended question?

answer; i do believe that the correct answer is ( portal of exit in the chain of transmission); good luck

answer; /// i believe that the correct answer is (c); ///when the lungs expand, they fill with air from the atmosphere;