Timed test What has been the MOST significant cause of the decline in death rate in less developed countries?

The discovery and dissemination of the smallpox vaccine
The beginning of scientific medicine and formal medical colleges
The transfer of disease prevention methods to less developed countries
The development of methods of containing disease-carrying bacteria
The beginning of the single-payer health care system in Western Europe

Which of the activities listed below could limit global warming by slowing the increase in atmospheric carbon dioxide levels? view available hint(s) select all that apply. a. replacing fossil fuels with nuclear energy b. burning vegetation to clear land for agriculture c. limiting soil erosion so organic matter takes longer to decompose d. choosing a fuel-efficient car, or bicycling to school or work e. using more electrical appliances and cars f. cutting down forests to build houses

¿qué parte de la patagonia está en peligro de exinción por su sobrepesca?

What gigantic island is primarily in the arctic circle?