Survival Needs

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Across
  1. 3. The promotion of hygiene and prevention of disease by maintenance of sanitary conditions
  2. 4. Consisting of oxygen within a particular range of pressure, concentration and purity is vital to survival
  3. 6. Something that covers or affords protection.
Down
  1. 1. the only thing that prevents our planet from being too cold to sustain life.
  2. 2. usually of plant, animal, or fungal origin, and contains essential nutrients, such as carbohydrates, fats, proteins, vitamins or minerals.
  3. 5. The natural, easily reversible periodic state of many living things that is marked by the absence of wakefulness and by the loss of consciousness of one’s surrounding.