Nature

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Across
  1. 3. they are insects and very colourful
  2. 5. they grow on plants and have petals
  3. 6. big ball of fire
Down
  1. 1. it's green and we walk on it
  2. 2. white and fluffy in the sky
  3. 3. they fly in the sky and 'chirp'
  4. 4. we get oxygen from them