week 18 crossword

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Across
  1. 1. The plural of child. [8]
  2. 8. A formula used to end a letter, typically a formal one in which the recipient is addressed by name. [9]
  3. 9. The process by which a plant uses the energy from the light of the sun to produce its own food. [14]
  4. 12. The guard cell that protect the stoma. [7]
  5. 14. The way that the colour or shape of an animal or plant appears to mix with its natural environment to prevent it from being seen by attackers. [10]
  6. 15. a long, thick glove, worn for protection. [8]
Down
  1. 2. An idea or explanation for something that is based on known facts but has not yet been proved. [10]
  2. 3. The very dry biome with almost no plants or animals. [6]
  3. 4. The answer to a division problem. [8]
  4. 5. The part of a cell that controls its growth. [7]
  5. 6. A symbol used to make numerals. [5]
  6. 7. Numbers that are easy to divide mentally. [10,7]
  7. 10. A mathematical processes using addition, subtraction, multiplication and addition. [9]
  8. 11. Patterns that use numbers. [7,7]
  9. 13. A long search for something that is difficult to find, or an attempt to achieve something difficult. [5]