Part 1: Great Transformation: how evolution works Great Transformations are the
ID: 290201 • Letter: P
Question
Part 1: Great Transformation: how evolution works Great Transformations are the many ways in which life evolved on Earth, one of these great transformation is the one that populated land with animals. 5:50: http://www.youtube.com/watch?v-A9NL5OL?do 1 - What are tetrapods? 2 - What can we infer about tetrapods common ancestors? We will now "follow" geologists Ted Deschler and Neil Shubin on a field trip to a roadside outcrop in Pennsylvania and do some in depth facies analysis. 3 - During which period of the Paleozoic did the rocks they are studying form? 4-What was the environment back then? 5 - What fossil did Dr. Deschlerfound and why is this so important?Explanation / Answer
1.Tetrapods : A four footed animal, especially a member of a group which includes all vertabrates higher than fishes.
2. Hundreds of million years ago there were no animals on land before then all our distant ancestors lived in water, so at some point you had the shift from life on water to life on land,that's a huge change it was the movement when fish crawled out of water and onto land .Just like us reptles, birds and mammals all have bodies with four limbs they all are tetrapods.
3.Devonian period
4. Back to the devonian , this place was very different and it was south of the equator remember continents are continually moving around and back it this time dealing with much more tropical climate pennsylvania. Hundreds of millions of yers ago the fossils and sedimets in these layers were collecting on the bottom of the stream.
5 A small shoulder bone (370 million years old) and it is the evidence that it developed find and went on land and developed 4 limbs. One f the earliest tetrapods.