Answer:
it was only 90 percent effective
Explanation:
In 1954 a massive controlled field trial was launched, sponsored by the National Foundation for Infantile Paralysis. Almost two million U.S. children between the ages of six and nine participated. In some areas of the country half of these “Polio Pioneers” received the vaccine, while half received a placebo. In other areas of the country children who did not receive any vaccine were carefully observed. On April 12, 1955, Thomas Francis, Salk’s mentor and the director of the trial, reported that the vaccine was safe, potent, and 90% effective in protecting against paralytic poliomyelitis.
Answer:
1. Photosynthesis
2.carbon dioxide
3. fossil fuel
4.cellular respiration
Explanation:
Photosynthesis is the important function takes place mostly in green plants which converts inorganic compounds, water, carbon dioxide to the glucose or organic compound in presence of light energy. It is an important reaction that is required for energy and for food for almost every organism.
Carbon dioxide is the carbon source for the plants to produce glucose or simple sugars with help of water and light energy.
Fossil fuels are formed by the process of decomposition of organic compound and organism of the prehistoric organism which is a carbon containing energy source.
Breaking down or catabolism of glucose in order to produce energy in the form of the ATP is called cellular respiration which is essential for cell to perform cellular functions.
B is the correct answer. A would have nothing to do with sunlight, also with c and d. B would cloud rhe skies, like what happened to the dinosaurs.
ATP, or adenosine triphosphate. The main source of energy for a cell.
