Input (grade 13): Deuterostomes are distinguished by their embryonic development; in deuterostomes, the first opening (the blastopore) becomes the anus, while in protostomes it becomes the mouth.
Output (grade 10): Deuterostomes are distingued by their embryo, in deuterostomes, the first opening (the blastopore) becomes the anus, while in protostomes it becomes the mouth.