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Geologic Time 03: Origin and Evolution of Life

Earth Space Science Virtual Tour

Patricia Cruz

on 19 May 2013

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Transcript of Geologic Time 03: Origin and Evolution of Life

Introduction Introduction Hello! Welcome back to another one of Patricia's Awesome Tours. Today I will take you along on an informative journey of the origins of the everyday mammal. We will find out where they came from and how they relate back to other organisms from the past. Also we will be finding out how mammals became what they are today. Stop #1: Biological Evolution Geologic Time 03: Origin and Evolution of Life Mammals started appearing on Earth about 200 million years ago. They appeared in the late Triassic period. Mammals evolved from therapsids (mammal-like reptiles) Stop #6: Where could they be found? Mammals are still presently alive.Pretty much anywhere in the world, except places of extremes, such as, intensely hot or cold places, mammals could live and thrive because they have adapted and evolved into those characteristics that allows them to live in such places. Stop #4: Physical Characteristics A Mammal is normally defined as a warm-blooded animal with a covering of fur, skin or hair which gives birth to live young who are nourished with milk, and who are vertebrate. Stop #8: Related Organisms Some organism that relate back to modern organism mammal-like beasts as Thrinaxodon and Cynognathus. By the time they went extinct in the mid-Jurassic period, some therapsids had evolved various proto-mammalian traits (fur, cold noses, warm-blooded metabolisms, and possibly live birthing) that were further elaborated upon by their descendants, the mammals that we know today. Virtual Tour Bibliography Stop #2: End of a Reign During the Triassic period, there was not much mammals on the planet just yet. The dinosaurs were very big, all the while the first mammals were very small. This did not allow the mammals to grow and develop that well. But with the end and the extinction of the dinosaurs during the end of the Cretaceous Period, the mammal really did have enough room to flourish and increase their dominance on the planet. Stop #3: Phylogeny Strauss, Bob. "The First Mammals – Mammals of the Triassic, Jurassic and Cretaceous Periods." About.com Dinosaurs. ©2013 About.com, n.d. Web. Mar. 2013. <http://dinosaurs.about.com/od/otherprehistoriclife/a/earlymammals.htm>. Phylogenics is the discipline of evolutionary biology which seeks to accurately depict the evolutionary relationships among living and non-living taxa. All organism began with the first bacteria 3.4 billion years ago. Slowly but surely,the bacteria evolved into the organisms that are leaving today. Evolution comes from genetic mutations that are developed through the generations when organism copulate. Genetic mutations allows the organisms to develop different traits and be different from on another. This leads to the branching as seen in the picture to the left. But this picture may be hard to understand to this so I put the picture to make it easier to understand the connectivity mammals have compared to the other organisms. Mammals Humans are right here Stop#5: What Makes Mammals Different? All mammals are animals, but not all animals are mammals. There are multiple kinds of animals. There are the birds that able to lay eggs and fly because they are covered in feathers. There are the reptiles that are cold-blooded with scaly skin. And then there are other types of animals that are different from mammals. Stop #7: Their Habitat Though, they could live at just about anywhere, their some necessities they must have in order to continue to survive and continue living. This would include the same things that we need, such as, clean water, clean air, shelter and space. Stop #9 and #10: The Past and Present These two stops will be seen together. These are some comparisons between the mammals of the past and present. Agriotherium and the Modern Bear Aepycamelus and the Modern Giraffe Basilosaurus and the Humpback Whale Strauss, Bob. "Basilosaurus." About.com Dinosaurs. ©2013 About.com, n.d. Web. Mar. 2013. <http://dinosaurs.about.com/od/mesozoicmammals/p/basilosaurus.htm>. Strauss, Bob. "Aepycamelus." About.com Dinosaurs. ©2013 About.com., n.d. Web. Mar. 2013. <http://dinosaurs.about.com/od/mesozoicmammals/p/aepycamelus.htm>. Strauss, Bob. "Agriotherium." About.com Dinosaurs. ©2013 About.com., n.d. Web. Mar. 2013. <http://dinosaurs.about.com/od/mesozoicmammals/p/Agriotherium.htm>.
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