The first polio vaccine was the inactivated polio vaccine. It was developed by Jonas Salk and came into use in 1955. The oral polio vaccine was developed by Albert Sabin and came into commercial use in 1961. They are on the World Health Organization's List of Essential Medicines, the most effective and safe medicines needed in a health system.
How many mountain ranges are shown on the map? Name the three that are in the Western Hemisphere. Eight mountain ranges; Rocky Mountains, Andes Mountains, and the Appalachian mountains. Name the five labeled mountain ranges in the Eastern Hemisphere. Himalayas, Atlas Mountains, Alps, Caucasus Mountains, and the Ural Mountains. Which mountain range acts as a natural border between Europe and Asia
The Andes contain the highest peaks in the Western Hemisphere. The highest of them is Mount Aconcagua (22,831 feet [6,959 metres]) on the border of Argentina and Chile (see Researcherâs Note: Height of Mount Aconcagua).