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A scientist uses radioactive dating to determine the age of a fossil and discovers that a hominid species may have existed much earlier in history than he thought. Which of the following would most likely increase the reliability of this finding?

Using radioactive dating to determine the age of similarly shaped fossils
Repeated analyses of the fossil finding it to be the same age each time
Using radioactive dating to find the age of fossils found in the same geographic location
Publication of his findings in different paleontology magazines