Life on Earth and Agriculture Crossword

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Across
  1. 1. ________ language, helps humans communicate more efficiently
  2. 5. was used more efficiently due to agriculture which manipulated the sun so that they could use more of the products of photosynthesis
  3. 7. _______ selection is when the environment picks with animals and plants survive
  4. 11. what people used before agriculture to sustain themselves
  5. 12. Too many people in the same place, one of the reasons why agriculture started
  6. 14. _________ selection is when humans pick which animals and plants survive
  7. 16. someone who tends plants and animals
  8. 18. to balance conditions in and outside an organism's body, one of the four qualities of life
  9. 19. changing over time, one of the four qualities of life
  10. 21. animals that are dependent on humans, a form of agriculture
  11. 22. our ancestors, the species we originated from
Down
  1. 2. _______ change, long-term change of temperature and weather patterns, one of the reasons why agriculture started
  2. 3. one of the four qualities of life, to take in energy
  3. 4. how organisms multiple, one of the four qualities of life
  4. 6. ___and RNA are the building blocks of life
  5. 8. human species, our species
  6. 9. needs to be in a certain range so that liquid stays liquid
  7. 10. __________ learning, how humans advance, accumulating knowledge
  8. 13. what complexity happened on earth 4 billion years ago
  9. 15. two species relying on each other for survival
  10. 17. sustains life, why life doesn't exist on planets too close or too far away from the sun
  11. 20. How our ancestors handled overpopulation before agriculture