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Archaeopteryx. Several fossils like this were found in southern Germany about 150 years ago. They were named Archaeopteryx. These fossils possessed characteristics of both reptiles and birds. . This Is Thought To Be the Appearance of the Fossil.

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PowerPoint Slideshow about 'Archaeopteryx' - Donna


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slide2

Several fossils like this were found in southern Germany about 150 years ago.They were named Archaeopteryx. These fossils possessed characteristics of both reptiles and birds.

slide4

Scientists who study only birds (ornithologists) think this is a true bird while others maintain it is transitional between a dinosaur and a bird. It is thought to be a missing link.

slide5

Think CriticallyThere are major differences between the reptile and bird. Are changes in the DNA necessary to accomplish the differences between the reptile and bird outlined by the following slides? If so, how could this have come about?

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1. The upper torso of an upright walking dinosaur is one of the weakest parts of its body. The upper limbs of Archaeopteryx are very highly developed. What does it take to make weak dinosaur upper legs into the strongest and most highly developed upper limbs of a bird?

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2. The scales of a dinosaur are folds in the skin and appear as one large sheet as is evidenced by the shed skin of a snake. Archaeopteryx has feathers. Feathers grow individually out of follicles. Flight feathers have tiny barbs similar to that of Velcro. How can the DNA be changed by random chance happenings to accomplish this?

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3. Only the lower jaw of a dinosaur moves. Both the upper and lower jaws of Archaeopteryx move just as all bird jaws do. What has to be done to make both jaws move?

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4. The feet of a dinosaur are adapted for walking. Archaeopteryx has grasping type of feet similar to that of a bird. What has to be done to a dinosaur foot to make it useful for grasping?

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5. The lungs of dinosaurs operate on a bellows principle. Evidence is that Archaeopteryx has bird-like lungs which operate on an entirely different principle. How is this change accomplished by random chance happenings?

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Think CriticallySince mutations and natural selection do not provide additional coherent information but may destroy it, how could a reptile turn into a bird?

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