1SARD FNAL A 115/140 FINAL TAKE-HOME TEST NAME Handwrite all parts of answer in

Question

1SARD FNAL A 115/140 FINAL TAKE-HOME TEST NAME Handwrite all parts of answer in the space provided. You you can illuminate your answers with illustrations drawings, diagrams, photos, prints, ete, on BOTH sides of UP TO THREE additional 8%" x 11" sheets of paper Su 2017 may continue on the back of a page if necessary. Also 1. In the "Your Inner Fish" video series, Neil Shubin shows that "we humans are all, every one of us, just jury- rigged fish". Explain what scientists have discovered regarding the major adaptations associated with each of the following transformational stages or "steps" in our evolutionary history. (refer to lecture and video notes texts, handouts, "Your Inner Fish" video series, and online resources to complete this assignment early transitional forms like Tiktaalik (the fishitetrapod fossils found in 375 My old deposits on Ellsmere Island), Paleozoic amphibians (like Eryops) Pelycosaurs (early mammal-like reptiles like Dimetrodon) Therapsids (advanced mammal-like reptiles like Thrinaxodon) early mammals (from 195 Mya) such as Hadrocodium

Explanation / Answer

Ans.) The modern human is evolved from its primitive form a lot as many of its characters are similar to other organisms. If the course of human evolution is minutely observed then one can conclude that the modern human is evolved from fish. Hence the assumption given in the question is quite right.

Early transitional forms like tiktaalik – Tiktaalik were the vanished lobe-finned fish from the late Devonian period. There morphological characteristics were similar to four-legged animals. They were considered as the evolutionary shift from fish to amphibians.

Paleozoic amphibians – Amphibians, the dominant tetrapods were evolved in Paleozoic era. The foremost amphibians like Eogyrinus also evolved during this period.

Pelycosaurs – They were the most primitive synapsida, also called as primitive Late Paleozoic synapsids (sometimes also called as mammal-like reptiles).

Therapsids - Therapsids were the descendants of synapsids. Basically, cynodonts is group of mammals and their ancestors which were evolved in Triassic period approximately 225 million years ago.

Early mammals - The above mentioned organism; Pelycosaurs, synapsids (herapsids and cynodonts) are regarded as as early mammals. . It is evident from the various studies that the early mammals developed from therapsids at the closing stages of the Triassic period and cohabited with dinosaurs during the Mesozoic Era.

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