Chapter 25 Vocabulary

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Across
  1. 5. a body cavity lined with mesoderm
  2. 9. the innermost germ layer
  3. 10. an animal whose mouth is formed from the blastopore
  4. 12. one of a pair of structures in the throat region of a chordate
  5. 13. a hollow ball of cells that develops when a zygote undergoes a series of cell divisions
Down
  1. 1. the middle germ layer
  2. 2. a long supporting rod that runs through ta chordate's body just below the nerve cord
  3. 3. an animal that lacks a backbone, or vertebral column
  4. 4. a fertilized egg
  5. 6. a body cavity that is only partially lined with mesoderm
  6. 7. a body plan in which body parts repeat around the center of the body
  7. 8. the outermost germ layer
  8. 11. an animal that has a backbone