The three correct answers that provide evidence that South America, Africa, Antarctica, and Australia were once together as one supercontinent are:
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Mountain chains match up where South America collided with Australia to form Pangaea.
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Cratons match across the edges of continents.
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Glacial deposits and scratches in the bedrock from an ice sheet match in distant regions.
These responses reflect geological and paleontological evidence supporting the theory of continental drift and the existence of a supercontinent, particularly Pangaea.