Q1Indicate an air pollutant among the following:Open this question (full page) A. Oxygen B. Nitrogen C. Water D. Carbon monoxide
Q2Biogas is the common name of:Open this question (full page) A. Natural gas B. Oxygen gas C. Carbon dioxide D. Nitrogen
Q3Which is a greenhouse gas?Open this question (full page) A. Carbon dioxide B. Methane C. Nitrous oxide D. All of these
