one

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Across
  1. 2. oposite of word unhealthy
  2. 3. a hormone produced in the brain that reduces the feeling of pain
  3. 5. a natural substance found in food that is an essential part of what humans and animals need to help them grow and stay healthy.
  4. 6. a picture or an impression in your mind of what somebody/something is like
Down
  1. 1. activity
  2. 2. usual behaviour
  3. 4. plants, animals