Unit 2 C - Life form - Unit 2 C Facts to Know 1 2 3 4 5 6...

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Unit 2 C – Facts to Know 1. What are the three domains of life? Archaea, bacteria, and eukaryote domains. 2. How long ago did the atmosphere become oxygenated? Roughly 2.45 billion years ago, the atmosphere became oxygenated. 3. How long ago did the dinosaurs go extinct? Dinosaurs went extinct about 65 million years ago. 4. What was Archaeopteryx? Archaeopteryx, German name is also called Urvogel, is a genus or early bird that is transitional between feathered dinosaurs and modern birds. 5. What percentage of our genes is identical to those in chimps? 98% of our genes is identical to those in chimps. 6. The accelerated rate at which humans are forcing other species into extinction is referred to as The Sixth Exinction. Unit 2 C – Thought Questions 1. Give a thumbnail sketch of our current understanding of the conditions that produced Earth’s first life forms. The protein was the Earth’s first life form, then the monad produced. There were no any life and no soil 500 millions ago, until about 400 millions ago, there was enough oxygen in the atmosphere and became ozone layer to protect the life forms under sunshine, so they can come up from water. The first life form was just a cell, all of the plants and animals in the earth today are make up by cells. 2. Based on your reading in Geographica what were a few of the critical events or turning points on the road to complex life that happened prior to 1 billion years ago? Evolution of multicellular organisms, multicellulartiy evolved as a result of a symbiotic relationship between cells of the same or different species, eventually leading to independency.
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