grade 7 puzzle

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Across
  1. 2. Bony covering of the brain.
  2. 3. Elongated tube-like structure extending downwards from the urinary bladder.
  3. 8. Structural and the functional unit of Nervous system.
  4. 9. Substances that provoke allergy.
  5. 10. The opening in the eye that passes light to the lens.
Down
  1. 1. A long-term disease that causes kidney damage.
  2. 4. Tissue present beneath the skin with other tissues.
  3. 5. Wheezing is an example of which environmental variation.
  4. 6. The allergy characterised by the raised welts on an individual's skin.
  5. 7. Process of removing excess salts and other wastes from blood.