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Copy of Origins of Life Activities.docx - Origins of Life...

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Origins of Life Activities Earth’s Early Atmosphere One of the biggest mysteries in science today is exactly how the universe began. Complete the graphic organizers using this resource to see what we know today about how life on Earth began. 1. Earth’s Early Atmosphere Earth’s Current Atmosphere Most abundant gases were Nitrogen Water vapor Carbon Dioxide Methane Major gasses today Nitrogen Oxygen 2. What three things do modern scientists hypothesize about the first life on Earth? 1. Early life forms did not need oxygen to survive. 2. Early life forms were probably unicellular organisms. 3. Early life forms probably lived in the oceans. 3. What did Miller and Urey try to recreate in their experiment? They were trying to recreate the conditions of early Earth. 4. What were the results of the Miller and Urey experiment? After Miller and Urey performed the experiment, the mixture they created contained some small chemical units that could form proteins. 5. Explain how each of the following details below supports the claim: Earth, and the life on it, has changed dramatically over time. Detail How it supports the claim Early organisms did not need oxygen to survive. Without oxygen, humans can’t function to survive. Fossils of bacteria-like organisms have been found that are between 3.4 and 3.5 billion years old. It shows how living organisms in early earth were very simple. The first cells were probably heterotrophs that used the chemicals in their surroundings for energy. As population grew, resources grew scarce, so organisms had to learn to make their own food. 1. Are the inferences made regarding the origins of life logical and based on experimental observations? Yes, since the experimental observations that have been made so far have proven inferences of the origins of life to be right and logical.
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Origins of Life Activities 2. “Scientific ideas expand and change over time.” Explain this statement. As new experimental observations are made, there are new discoveries that cause scientific ideas to change or be modified to support those new discoveries. Here we will look at one of the earliest contributions to our current understanding of the origins of life. The contributions were made by Louis Pasteur and Francesco Redi. Redi and Pasteur both worked around a popular idea at the time of spontaneous generation. At the time, spontaneous generation; the hypothetical process by which living organisms develop from nonliving matter; was utilized to explain the origin of life . According to this theory, pieces of cheese and bread wrapped in rags and left in a dark corner, for example, were thus thought to produce mice , because after several weeks there were mice in the rags. Many believed in spontaneous generation because it explained such occurrences as the appearance of maggots on decaying meat.
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