Pick one major phylum that is discussed in this week's chapters

Pick one major phylum that is discussed in this week's chapters. In your original post explain what distinguishes the phylum you picked from other phyla of the same kingdom. For example, Phylum Chordata is part of Kingdom Animalia. What makes chordates different from other animals is that they have a post anal tail at some point in their life and they have a hollow nerve cord (spinal cord). (Note: do not use this example and, of course, you will need to go into more detail and you can even give examples of animals in that phylum.)