The three correct answers that provide evidence that South America, Africa, Antarctica, and Australia were once part of a supercontinent (Pangaea) are:
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Mountain chains match up where South America collided with Australia to form Pangaea.
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Glacial deposits and scratches in the bedrock from an ice sheet match in distant regions.
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Fossils of marsupials were originally the same across South America and Australia.
These pieces of evidence support the idea of continental drift and the existence of Pangaea by showing geological, glacial, and paleontological connections between the continents.