Sulfur combines with atmospheric to form sulfuric acid.
oxygen
water vapor
nitrogen
none of the above

When should a bar graph be used? a. when there is no independent variable. b. when the independent variable is continuous and does not show a relationship to the dependent variable. c. when the independent variable is continuous and shows a causal link to the dependent variable. d. when the independent variable is composed of categories and does not show a relationship.

During sunny hours, a large amount of build up between the hours of 1: 00-5: 00 pm. a. ozone b. mercury c. lead d. sulfuric acid

Which medullary index indicates a human hair? a. 0.653 b. 0.733 c. 0.516 d. 0.256