Biology I - Crossword #3: Words starting with the letters D, E, G, H

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Across
  1. 2. pure substance that consists entirely of one type of atom
  2. 7. movement of individuals out of an area, the opposite of immigration
  3. 9. relatively constant internal physical and chemical conditions that organisms maintain
  4. 10. destruction of forests
  5. 12. possible explanation for a set of observations or possible answer to a scientific question
  6. 13. negatively charged particles, located in the space surrounding the nucleus
Down
  1. 1. organism that obtains energy by eating only plants
  2. 3. developing stage of a multicellular organism
  3. 4. scientific study of heredity
  4. 5. scientific study of human populations
  5. 6. term used to refer to a type of tree that sheds its leaves during a particular season each year
  6. 8. area where an organism lives, including the biotic and abiotic factors that affect it
  7. 11. scientific study of interactions among organisms and between organisms and their environment
  8. 14. kind of wetland formed where a river meets the ocean