MRS GREN: signs of life

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Across
  1. 2. Oxygen around the body
  2. 3. Tomevenm(anagram)
  3. 5. I can feel you!
  4. 6. Good food
Down
  1. 1. "Class, its a perfectly natural function & you might just as well get used to it"
  2. 2. Generation after generation...
  3. 4. Reach for the skies