Exam 1 - Question1 (2points)

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Question 1    (2 points) 1. The appearance of multicellular organisms coincided with increased levels of _______ in Earth's atmosphere.  Student response: Percent Value Correct Response Student Response Answer Choices 0.0% a. a. sulfur 0.0% b. b. hydrogen 0.0% c. c. nitrogen 0.0% d. d. carbon 100.0% e. e. oxygen  Score: 2 / 2   Question 2    (2 points) 2. The possible collision of a large meteorite with Earth 65 million years ago may explain  Student response: Percent Value Correct Response Student Response Answer Choices 0.0% a. a. the theory of Gondwana. 0.0% b. b. Alfred Wegner's concept of  continental drift. 100.0% c. c. the mass extinction that occurred  at the end of the Cretaceous period. 0.0% d. d. contemporary atmospheric  conditions on Earth. 0.0% e. e. None of the above  Score: 2 / 2   Question 3    (2 points) 3. The half-life of a particular radioactive isotope of element X is 100 years. If you know that 400 years ago a fossil contained  10 mg of this isotope, about how much would you expect to find in that fossil today?  Student response: Percent Value Correct Response Student Response Answer Choices 0.0% a. a. 5 mg 0.0% b. b. 2.5 mg 100.0% c. c. 0.6 mg 0.0% d. d. 0.3 mg 0.0% e. e. 0.15 mg 
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Score: 2 / 2   Question 4    (2 points) 4. Which of the following properties or processes do we associate with living things?  Student response: Percent Value Correct Response Student Response Answer Choices 0.0% a. a. responding to the environment 0.0% b. b. evolutionary adaptations 0.0% c. c. energy processing 0.0% d. d. growth and reproduction 100.0% e. e. all of the above  Score: 2 / 2   Question 5    (2 points) 5. Which of the following is (are) true of natural selection?  Student response: Percent Value Correct Response Student Response Answer Choices 0.0% a. a. results in descent with  modification 0.0% b. b. requires genetic variation 0.0% c. c. involves differential reproductive  success 0.0% d. d. B and C only 100.0% e. e. A, B, and C  Score: 2 / 2   Question 6    (2 points) 6. Radioisotopes are often used to determine the time of death of fossilized remains. Tritium has a half-life of 12.3 years.  That means that 24.6 years after an organism dies it will have _______ of the original radioactive tritium.  Student response: Percent Value Correct Response Student Response Answer Choices 0.0% a. a. all 0.0% b. b. 1/2 0.0% c. c. none 100.0% d. d. 1/4 0.0% e. e. 1_8 
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Score: 2 / 2   Question 7    (2 points) 7. Over much of its history, the climate of Earth was  Student response: Percent Value Correct Response Student Response Answer Choices 0.0% a. a. about the same as it is today. 0.0%
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Exam 1 - Question1 (2points)

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