In humans, the pelvis and femur, or thigh bone, are involved in walking. in whales the pelvis and femur are
a) examples of fossils
b) vestigial structures
c) acquired traits
d) examples of natural selection

Sarah and john are having a discussion on genetic diversity. sarah believes that it happen over a long period of time. john it happens immediately. who is correct? a. sarah is correct because genetic diversity occurs over a long period of time. b. john is correct because genetic diversity occurs immediately. c. both are correct because genetic variation can occur or long period of time. d. neither are correct because genetic diversity occurs over any period of time