unit 5 crossword puzzle

12345678910
Across
  1. 3. having existed for a long time
  2. 6. relating to the heart and blood vessels
  3. 7. noticeable, eye-catching
  4. 9. substance produced in an organism
  5. 10. urgent and severe
Down
  1. 1. great destruction or damage
  2. 2. pressure or tension
  3. 4. a system with a way of doing sth
  4. 5. make stronger
  5. 8. put or send out