Chordates evolution

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Across
  1. 3. Rod-like support structure found in the embryo stage of all chordates
  2. 5. SLITS Feature used for gas exchange in early chordates
  3. 6. Parasites that live on the surface of a host
  4. 8. Living link to early chordates, also known as the lancelet
  5. 9. FISH Fish with fleshy fins representing the transition stage to land
Down
  1. 1. Type of parasite that lives inside the host
  2. 2. Group of animals sharing a common ancestor defined by 5 key features
  3. 4. Organisms that live on or in a host obtaining nutrients and shelter
  4. 7. EGG Waterproof egg that allowed reptiles to reproduce independently of water
  5. 9. Respiratory organs developed for air-breathing during the move to land