Which of the following does not add CO2 to the atmosphere? A. Cooking with gas
B. Planting trees
C. Burning wood
D. Riding in a bus

Which statement correctly describes a way that mutations increase the likelihood that a species will survive in a changing environment

How does science influence the decisions made about social, economic, and political issues?

Which of the following types of pollution is most responsible for large numbers of deaths worldwide because of unsafe drinking water? (a) nutrient pollution (b) thermal pollution (c) pathogen pollution (d) sediment pollution