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Why do scientists think that birds evolved from dinosaurs? a. some dinosaurs had feathers. b. birds and dinosaurs appeared on earth at approximately the same time. c. both are warm-blooded animals. d. birds and dinosaurs have more efficient hearts and lungs than mammals.
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Scientific evidence is most likely to be consistent if it is based on data from
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Why do some dna fragments move farther than others during gel electrophoresis? a. because their shapes are different b. because they are different types of molecules c. because the samples are different colors d. because their masses are different
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