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Question

Put responses in the correct input to answer the question.

Galaxies can be grouped by the age of the stars they tend to contain, with ______ galaxies having the youngest stars and _______ galaxies having the oldest stars.

spiral

elliptical

irregular

Answer 1

Galaxies can be grouped by the age of the stars they tend to contain, with spiral galaxies having the youngest stars and elliptical galaxies having the oldest stars.