Ch 19 & 20 FRQ's - Lucia Kajganic Period 3 Chapter 19 20 Free Response Questions 1 a Given the three samples of rocks to search for a transitional

Ch 19 & 20 FRQ's - Lucia Kajganic Period 3 Chapter 19...

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Lucia Kajganic Period 3 Chapter 19 & 20 Free Response Questions 1. a) Given the three samples of rocks to search for a transitional species between lobe finned fishes and amphibians, I’d chose to search in the rock samples that are 370 million years old. The transition between these two species were said to have taken place around 380 to 360 million years ago, so the 370 year old rocks must have been found in a strata of rocks that date back to that time period, which falls right in between 380 and 360 million years ago. b) When looking at these rocks, we would have to look at the characteristic and certain bone structures of the organisms we see. A transitional species between a lobe-finned fish would have to have both fish like and tetrapod like characteristics. Evidence of a transitional species that could be found in fossils would be based on anatomical structures. For example, fish characteristics such as fins, gills, and scales would have to be present, but the fossil would also have to display tetrapod like bone structures such as ribs to help it breathe air and support its body on land, neck and
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