Passage Summary: Scientists think South America and Africa used to be stuck together like puzzle pieces before the continents drifted apart.

Conclusion: South America and Africa were once physically connected at their current coastlines.

Reasoning: The theory of continental drift posits that modern continents were once a single landmass that fractured and drifted apart over time.

Analysis: To support the hypothesis that these two specific continents were once joined, we need evidence of continuity that survives the separation. Look for an answer that identifies identical geological features, such as specific rock strata or rare fossil sequences, that appear on the east coast of South America and the west coast of Africa. Such a discovery would act like matching the grain on two pieces of a broken board, providing strong physical evidence of their former union.