Some life forms move so slowly that their movement cannot be detected by normal observation. the best way to determine any movement is by placing a mark at some point, and observing any change in position from it. why is this true? a. the life form returns to that mark. b. the mark is a reference point. c. the mark is a standard unit. d. the mark makes measuring convenient.
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Some life forms move so slowly that their movement cannot be detected by normal observation. the bes...
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