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    Evolution: Protostomes and Deuterostomes

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    Once multicellular organisms evolved bilateral symmetry, they soon split into two major evolutionary lines: Protostomes and Dueterostomes. Examples of protostomes include insects, earthworms, and clams; examples of dueterostomes include humans, snakes, and sea urchins.

    What is the scientific/evolutionary basis of dividing most multicellular animals into these two groups and list two (2) specific differences theses two groups exhibit.

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    Solution Preview

    Protostomes and deuterostomes differ in the development of the digestive tract. In protostomes, the mouth and the anus develop directly from the blastopore (the first opening of the digestive tract). In deuterostomes, the blastopore develops into the anus and the mouth develops separately. ("Stoma" ...

    Solution Summary

    The differences between protostomes and deuterostomes are determined.