29.2 The Vertebrates​

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Across
  1. 5. (2 words) A characteristic of vertebrates, this REPLACES the embryonic notochord​ & is evident of segmentation.
  2. 8. Amniotes are great because they allow reproduction on what?
  3. 9. Chordates appeared during the start of this era.
  4. 11. This organ serves as excretion & water regulation to regulate water balance in the body.
  5. 12. Vertebrates have this type of circulatory system.
  6. 13. Another name for vertebrates with jaws
Down
  1. 1. System of vertebrates which consists of gills or lungs
  2. 2. A characteristic of vertebrates, this is the high degree of Cephalization, protects Brain, & has complex sense organs.
  3. 3. Vertebrates with 4 limbs (hence, Amphibians)
  4. 4. (2 words) Amphibians evolved from these organisms during the Devonian period.
  5. 6. A characteristic of vertebrates, this protects internal organs, an attachment to muscles, & living tissue that grows.
  6. 7. (name) These fishes were the Earliest vertebrates​.
  7. 10. Vertebrates that produce Amniotic egg, surrounding embryo in amniotic fluid