Life and Oxygen Essay Example for Free

Life and Oxygen EssayThis assignment requires answering questions based on the exhibit The Earliest Traces of Life at the Smithsonian Museum of Natural History, Washington, D.C. The exhibit that you are to see is on the upright side as you enter the Rotunda from Jefferson Street. Enter the exhibit h all(prenominal) under the dinosaur banner. As you go by this doorway, the exhibit is located to the right. For additional information on the location, hours, ect., go the museum web site at www.mnh.si.edu and prate on the Information desk link.Study the exhibit and answer the following questions. Submit your answers in Blackboard. Please judgment the short movie that comes along with the exhibit.Early Atmosphere1. How abundant was type O in the early standard atmosphere? The amount of oxygen in the atmosphere was abundant, however, due harmful radiation waves from the sun, photosynthetic systems such as plants were non able to evolve thus leaving the state of oxygen subtle. 2.What evidence do scientists turn out that the oxygen content of our atmosphere has increased since the earths origin?The O-zone layer is composed of 3 oxygen atoms formed after photosynthetic organisms release an extra oxygen molecule into the atmosphere. 2. Why is oxygen more abundant in the atmosphere today?Because of the high amount of plants that produce oxygen which were not here in the early stages of livelihood on earth 3. What are stromatolites? Stromatolites are the bindings of microorganisms on rocks and stones, normally submerged underwater, these rocks are usually used as samples for the earliest signs of life 4. What do scientists think is implied by the presence of stromatolites in Precambrian rock? Scientists would conclude that life was formed underwater and the process of evolution at long last allowed multi-cellular organisms to make their way off the ocean and/or bodies of water. 5. What is ozone and how is it produced?The o-zone layer is the protective layer made o f 3 oxygen atoms, it is usually formed by the extra oxygen resulted from a photosynthetic organism. 6. Why is ozone of import to life today?Because it protects us from ultra-violet rays from the sun which are extremely harmful and sometimes fatal to all life forms. 7. What effect did increased levels of oxygen in the atmosphere have on early life forms? It caused organisms that were not light and/or oxygen dependent to disappear as mammals and other multi-cellular organisms began to take over.