Which factors increase the likelihood of pandemic flu? a. increased animal contact b. increased chronic diseases c. decreased urban migration d. decreased population growth

Which would happen if more forests were cut down? a. the nitrogen cycle would be stopped b. nitrogen would be fixed by bacteria more quickly c. the amount of co2 in the atmosphere would increase d. fossil fuels would build up in the soil c the amount of co2 in the atmosphere would increase

Where do the respiratory and circulatory systems meet? a. in the heart b. in the muscles c. in the lungs d. in the brain

Solutions to environmental problems in europe must