Crossword

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Across
  1. 4. Pigment needed for photosynthesis
  2. 6. Plant use it gain energy
  3. 8. Study of living things
  4. 9. The last planet in the solar system
Down
  1. 1. A dwarf planet
  2. 2. Organ which fishes use to breathe
  3. 3. Known as the 'Red Planet'
  4. 5. Nearest star to the sun
  5. 7. A famous scientist who wrote a lot about relativity