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Across
  1. 3. - Groups of atoms bonded together.
  2. 5. - Small flat spots or discolored patches on the skin.
  3. 6. - Twilight or sunset periods.
  4. 7. - Small cavities or compartments in a plant or organ.
Down
  1. 1. - Microscopic or very tiny aquatic creatures.
  2. 2. - Small nuts or nutlets in botany.
  3. 4. - Exhalant openings in a sponge.