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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Glacial deposits and scratches in the bedrock from an ice sheet match in distant regions. - This indicates that these areas were once connected and experienced similar climatic conditions.
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Cratons match across the edges of continents. - The alignment of ancient rock formations supports the idea of these continents being part of a larger landmass.
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Fossils of marsupials were originally the same across South America and Australia. - The presence of similar fossils on continents that are now separated suggests that they were once joined.
These pieces of evidence support the theory of continental drift and the existence of the supercontinent Pangaea.