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a-Tiktaalik is a fish that lived 375 million years ago that grew to three metres long and had aquatic features mixed with others more suited to life on land. The fossils of five Tiktaalik specimens reveal that the animals had a large, robust pelvic girdle, a prominent hip joint, and long hind fins. The powerful fins could have propelled the beast in the water, but also helped it walk on riverbeds, or scramble around on mudflats. It is believed that Tiktaalik evolved into four-legged land animals. The scientists have yet to find a Tiktaalik hind fin bone, or any remains that might shed light on the origins of toes. A picture of Tiktaalik is available at https://www.npr.org/2010/07/05/127937070/the-human-edge-finding-our-inner-fish Describe how Darwin would explain that evolution of hind legs (of land animals) actually began as enhanced hind fins (of Tiktaalik), referring to his relevant observations and inferences (History of Evolutionary Thought). Indicate where the observations and inferences are illustrated in your answer. b- we examined the evolution of frog species. After the construction of a highway, at year 5000 (Species Concepts and Speciation), the population at the right side of the highway and the population at the left side of the highway evolved into two new species. What mode of speciation--allopatric or sympatric--led to these two frog species? Provide your reasoning making reference to the information that you know about these organisms.

a-Tiktaalik is a fish that lived 375 million years ago that grew to three metres long and had aquatic features mixed with others more suited to life on land. The fossils of five Tiktaalik specimens reveal that the animals had a large, robust pelvic girdle, a prominent hip joint, and long hind fins. The powerful fins could have propelled the beast in the water, but also helped it walk on riverbeds, or scramble around on mudflats. It is believed that Tiktaalik evolved into four-legged land animals. The scientists have yet to find a Tiktaalik hind fin bone, or any remains that might shed light on the origins of toes. A picture of Tiktaalik is available at https://www.npr.org/2010/07/05/127937070/the-human-edge-finding-our-inner-fish Describe how Darwin would explain that evolution of hind legs (of land animals) actually began as enhanced hind fins (of Tiktaalik), referring to his relevant observations and inferences (History of Evolutionary Thought). Indicate where the observations and inferences are illustrated in your answer. b- we examined the evolution of frog species. After the construction of a highway, at year 5000 (Species Concepts and Speciation), the population at the right side of the highway and the population at the left side of the highway evolved into two new species. What mode of speciation--allopatric or sympatric--led to these two frog species? Provide your reasoning making reference to the information that you know about these organisms.

Concepts of Biology
Concepts of Biology
1st Edition
ISBN:9781938168116
Author:Samantha Fowler, Rebecca Roush, James Wise
Publisher:Samantha Fowler, Rebecca Roush, James Wise
Chapter15: Diversity Of Animals
Section: Chapter Questions
Problem 3ACQ: Figure 15.33 Which of the following statements about common features of chordates is true? a. The...
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a- Tiktaalik is a fish that lived 375 million years ago that grew to three metres long and had aquatic features mixed with others more suited to life on land. The fossils of five Tiktaalik specimens reveal that the animals had a large, robust pelvic girdle, a prominent hip joint, and long hind fins. The powerful fins could have propelled the beast in the water, but also helped it walk on riverbeds, or scramble around on mudflats. It is believed that Tiktaalik evolved into four-legged land animals. The scientists have yet to find a Tiktaalik hind fin bone, or any remains that might shed light on the origins of toes. A picture of Tiktaalik is available at https://www.npr.org/2010/07/05/127937070/the-human-edge-finding-our-inner-fish Describe how Darwin would explain that evolution of hind legs (of land animals) actually began as enhanced hind fins (of Tiktaalik), referring to his relevant observations and inferences (History of Evolutionary Thought). Indicate where the observations and inferences are illustrated in your answer. b- we examined the evolution of frog species. After the construction of a highway, at year 5000 (Species Concepts and Speciation), the population at the right side of the highway and the population at the left side of the highway evolved into two new species. What mode of speciation--allopatric or sympatric--led to these two frog species? Provide your reasoning making reference to the information that you know about these organisms.
Transcribed Image Text:a- Tiktaalik is a fish that lived 375 million years ago that grew to three metres long and had aquatic features mixed with others more suited to life on land. The fossils of five Tiktaalik specimens reveal that the animals had a large, robust pelvic girdle, a prominent hip joint, and long hind fins. The powerful fins could have propelled the beast in the water, but also helped it walk on riverbeds, or scramble around on mudflats. It is believed that Tiktaalik evolved into four-legged land animals. The scientists have yet to find a Tiktaalik hind fin bone, or any remains that might shed light on the origins of toes. A picture of Tiktaalik is available at https://www.npr.org/2010/07/05/127937070/the-human-edge-finding-our-inner-fish Describe how Darwin would explain that evolution of hind legs (of land animals) actually began as enhanced hind fins (of Tiktaalik), referring to his relevant observations and inferences (History of Evolutionary Thought). Indicate where the observations and inferences are illustrated in your answer. b- we examined the evolution of frog species. After the construction of a highway, at year 5000 (Species Concepts and Speciation), the population at the right side of the highway and the population at the left side of the highway evolved into two new species. What mode of speciation--allopatric or sympatric--led to these two frog species? Provide your reasoning making reference to the information that you know about these organisms.
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