(Question)
Q: What sulfur compound occurs in volcanic gases and in the atmosphere near industrial plants? Choices: - sulfur hydroxide - carbon sulfide - nitrogen sulfide - sulfur dioxide A:
(Answer)
sulfur dioxide

(Question)
Q: Stis are diseases caused by what that spread through sexual contact? Choices: - amoeba - ecosystems - parasites - pathogens A:
(Answer)
pathogens

(Question)
Q: What measure is resorted to by people who wish to screen out genetic abnormalities in the fetus? Choices: - contraceptive use - in vitro fertilization - stem cell therapy - prenatal testing A:
(Answer)
prenatal testing