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What word is used to describe differences of individual organisms

Based on anatomical similarities, to which modern animal is dr. digger’s creature most closely related?

Select the situation bellow that would produce a total displacement of zero. a. a trip to the moon and then to mars b. a horse galloping from one end of a field to another c. the criss-crossing path of a bug as it flies from flower to flower d.a round-trip ride to school and back