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
At the cervical region the spinal column is further classified into an upper and lower cervical region. The atlas is one of the two upper cervical vertebrae, also known as C1, which is the topmost vertebra of the spinal column. It is the vertebra that is in contact with the occipital bone, a flat bone located at the back portion of the head.