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bapps/assessment/take/launchjsp?course assessment id 944825_18cour ca Search ASU Home My ASU Colleges & Schoois Map & Locations Organizations Help QUESTION 1 Which of the following correctly describes the effect of climate on the evolution of vertebrates in the Mesozoic? O Temperatures increased across the Permian-Triassic boundary favoring the evolution of larger vertebrate fauna. O Oxygen dropped across the Permian-Triassic boundary acting as a selective pressure for more efficient O Carbon dioxide dropped across the Permian-Triassic boundary reducing the growth of plants which lowered O The climate becomes more homogeneous in the Permian than in the Triassic slowing the rate of evolutionary respiratory systems food source availability change. QUESTION 2 Which of the following traits is a synapomorphy of the clade Archosauria? A single temporal fenestrae for increased jaw musculature

Explanation / Answer

Option last is the correct answer. Earlier the eart was very hot which became cool slowly and thus the temperature during permion (before mesozoic era) was higher and thus option first is not correct. Also the level of oxygen increased during traissic period (very first stage of mesozoic) because of growth of algae and plants and thus option 2nd is also not correct. The CO2 levels at the beginning of the mesozoic period were the highest in over 350 million years, indicating a hot climate worldwide and thus option 3rd is also not correct.

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