What information is not necessary for determining the effects of a pollutant on individual health?

What can friends provide to affect mental health positively? a)peer pressureb)challengesc)conflictd)companionship

What is the difference between a license and a certificate in the healthcare system? a. a certificate grants the freedom to practice, while a license only confirms professional qualifications. b. a license grants the freedom to practice, while a certificate only confirms professional qualifications. c. medical doctors receive licenses, and nurses receive certificates. d. medical doctors receive certificates, and nurses receive licenses. i'll give you 30

This is a science question: all drugs can be described as substances that a. result in addiction. b. relieve pain or other symptons of illness. c. cause a change in a persons body or behavior. d. are illegal.