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Insect wing

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BIOLOGY SECTION I Time? I hour and 30 minutes Directions: Each of the questions or incomplete statements below is followed by five suggested answers or comple tions. Select the one that is best in each case and then fill in the corresponding oval on the answer sheet. ? 1. The bones of a human arm are homologous to?structures in all of the following EXCEPT a whale flipper bat wing butterfly wing bird wing (E) frog forelimb 2. Competition for food would probably be most?severe between two closely related species in different niches closely related species in similar niches unrelated species in different communities unrelated species in the same community occu- pying different niches (E) ecological equivalents in different niches

morphology

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Emily Hebel September 11, 2011 Critical Reading #1 Task 1 A negative control in your experiment shows the experimenter that your experiment actually works in the way that it should, when you neglect the experimental variable. It makes sure there is no effect when there should be no effect. A negative control also rules out any alternative explanations. A negative control addresses the concerns that there could be something else causing the reaction.
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