History Of Life (Precambrian Life)

History Of Life (Precambrian Life).

 This discussion blog consists of four (4) sections/parts. Carefully answer at least one question of each section and discuss critically at least one of the answers provided by your classmates. Each question cannot be answered for more than 3 students. Use all the resources available in your module section of Canvas. Plagiarism will be highly penalized. Part 1: Early life1a) Why life is subdivided into three Domains? Contrast the features of Archaea, Bacteria, and Eukaryotes and provide examples of each group. 1b) What type of organisms are stromatoliths? How are they formed? Why are they so important?1c) Describe the endosymbiosis theory of eukaryote origins.1d) When did sexual reproduction appear and what is the big deal about it?1e) What are redbeds and Iron Banded Formations? How do they form? 1f) What was the great oxygenation event? When did it happen? How does it relate to the evolution of cyanobacteria and to the formation of BIF? Part 2: Diversification of Eukaryotes and Evolution of Metazoans2a) Describe the probable evolutionary steps for the making and diversification of metazoans from choanoflagellates.2b) Contrast the organization level, and general structure of sponges, cnidarians, and bilaterians. 2c) List the nine phyla of metazoans with paleontological importance and describe the features that make those phyla unique. Include examples of each Phila.2d) Describe the functions of structural and regulatory genes. 2e) Describe what Hox genes are, as well as their function and hypothetical role in the diversification of metazoans.2f) Describe and contrast between the Snowball and Slushball Earth models for the Cryogenian.2g) Describe how the cold episodes of the Cryogenian provided conditions for the diversification of eukaryotes and the evolution of Metazoans. 2h) List examples (include pictures) of the forms of life that inhabited the ocean during the Cryogenian. Part 3: Ediacaran Faunas3a) What was the Ediacaran period and what is its relationship to the Cryogenian and the Precambrian. How long did it last? Why is it important? How is it defined? Include a geological time scale and point the location of the Ediacaran. 3b) Describe the main components of the Ediacaran Fauna. Why is important in the history of life on planet Earth? Include photographic examples3c) Describe the environmental conditions that gave rise to the Ediacaran fauna. How the Snowball Earth/Slushball Earth episodes contributed to the rise of the Ediacaran radiation?3d) What were the main characteristics and evolutionary innovations evident in the Ediacaran Fauna? Provide an example of one of the organisms common in the Ediacaran. Include a picture and very short description, include some systematic information, stratigraphic range, ecology, and geographical location of the chosen fossil. Part 4, The Cambrian Faunas3a) What was the Cambrian period and what is its relationship to the Ediacaran and the Precambrian. How long did it last? Why is it important? How is it defined? Include a geological time scale and point the location of the Cambrian. 4a) What were the main characteristics and evolutionary innovations evident in the Cambrian Fauna?4b) Provide an example of one of the organisms that made their appearance during the Cambrian explosion. Include a picture and very short description, include some systematic information, stratigraphical range, ecology, and geographical location of your fossil.4c) What were the possible ecological and/or environmental conditions leading to the Cambrian explosion? Discuss

History Of Life (Precambrian Life)