Astronomy Unsw - Phys 1160 Module 3 Answers - 1818 Words

School of Physics Faculty of Science Moodle Home Announcements User Guides i PHYS1160- ­Introduction to Astronomy T1 2014 You are logged in as Henry Cai (Logout) My courses UNSWA - ­ University of New South Wales SCI - ­ Faculty of Science PHYS - ­ School of Physics Module 3 (Weeks 5- ­6) — Life on Earth and in the Solar System PHYS1160- ­5144_01311 Module 3 Quiz Quiz navigation 1 2 3 4 5 6 7 8 9 10 11 Started on State Completed on Time taken Grade Question 1 Correct Mark 5.00 out of 5.00 Flag question Saturday, 19 April 2014, 4:38 PM Finished Saturday, 19 April 2014, 5:30 PM 51 mins 31 secs 100.00 out of a maximum of 100.00 12 13 14 15 16†¦show more content†¦Question 9 Correct Mark 5.00 out of 5.00 Flag question Microscopic organisms known as cyanobacteria are interesting for the following reasons: [SELECT ALL THAT APPLY] Select one or more: A. Oxygen produced by their photosynthesis is thought to be responsible for the great oxygenation event about 2.3 billion years ago. B. The methane they produce is a greenhouse gas that could have helped warm the early Earth, helping to resolve the Early- ­faint- ­Sun paradox. C. The chloroplasts that carry out photosynthesis in green plants are evolutionary descendents of early cyanobacteria. D. They are known to be the earliest forms of life on Earth. Check Correct Marks for this submission: 5.00/5.00. Question 10 Correct Mark 5.00 out of 5.00 Flag question Evidence for life on early Earth (e.g. in the Pre Cambrian) has proved difficult to find because: SELECT ALL THAT APPLY Select one or more: A. rocks from these early times are rare due to the recycling of the Earths crust through plate tectonics B. there was no oxygen in the Earths atmosphere at this time C. life at this time lacked hard parts (such as shells or bones) that fossilise easily D. life had not yet emerged onto land E. life at this time was mostly microbial Check Correct Marks for this