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Bio 117 Exam 1 | Questions & 100% Correct Answers (Verified) | Latest Update | Grade A+

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Evolution Correct Answer: A change in a population overtime *change = usually a slight modification of traits Vestigial Trait Correct Answer: A trait or characteristic that does not function well or at all How can vestigial traits be used to show change in organisms over time? Correct Answer: They are a trait present in ancestors but no longer useful in living organism. Examples: tail bones in humans Examples of vestigial traits Correct Answer: Examples: *Tail bone in humans (compare to monkey, which uses it for balance and locomotion) * Hip bone in whales 2 * Goosebumps in humans (erect hair on chimp- insulation/emotional display) Describe the three types of homology discussed in class that are used as evidence for decent of extant species from common ancestors. Correct Answer: 1. Comparative Anatomy 2. Comparative Embryology 3. Molecular Biology homology Correct Answer: If organisms are similar than they came from the same origin. Homologous Sructure

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