The death of the dinosaurs opened up the door for what species to dominate (and fill in the newly empty niche)?
A) Fish.
B) Mammals.
C) Reptiles.
D) Birds.

Name: The death of the dinosaurs opened up the door for what species to dominate (and fill in the newly empty niche)? A) Fish. B) Mammals. C) Reptiles. D) Birds.
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Mammals were able to fill the newly empty niche left by the dinosaurs because they were able to adapt to the changing environment and evolve into a variety of different species.

The Death of the Dinosaurs Opened Up the Door for What