Which observation led Darwin to propose that the glyptodont is related to the armadillo?
A) Both species lived in the same region at the same time.
B) Both species went extinct at the same time.
C) Both species are adapted for marine life.
D) Both species have helmets, bony shells, and unusual bony plates.
E) Each species are found in different regions of the world.

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Darwin observed that both the glyptodont and the armadillo have similar physical characteristics, such as helmets, bony shells, and unusual bony plates, which led him to propose that they are related.

Which Observation Led Darwin to Propose That the Glyptodont Is