Evolution of circulatory system

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Across
  1. 3. Pulsatile organ developed in arthropods
  2. 5. Branched digestive system is observed
  3. 6. Circulatory system where blood floods tissues directly
  4. 7. Gastrovascular cavity observed in cnidarian
  5. 9. Body cavity in roundworms for material distribution
  6. 10. Unicellular organism showing protoplasmic movement
Down
  1. 1. Blind sac–like cavity used for digestion and transport
  2. 2. Oxygen is directly supplied to the tissues in....
  3. 4. Animals that use sea water for transportation
  4. 8. Circulatory system where blood flows through vessels