By the Late ____ period the Chordates had expanded to include a number of different taxa with skeletal elements such as a rudimentary braincase.

Name: By the Late ____ period the Chordates had expanded to include a number of different taxa with skeletal elements such as a rudimentary braincase.
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The Cambrian period is known for the "Cambrian Explosion," a time when many major groups of animals first appeared, including early chordates with skeletal elements like a rudimentary braincase.

By the Late ____ Period the Chordates Had Expanded to Include