Evolution

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Across
  1. 2. the remains or traces of organisms that lived in past ages
  2. 4. the mass of gases that surround Earth
  3. 6. the evolution of a new species from an existing species
  4. 8. the process of change in species and populations of organisms over time
  5. 12. prokaryotes that make food by photosynthesis
Down
  1. 1. a group of similar organisms that can interbreed and produce fertile offspring
  2. 3. an organism's ability to withstand the effects of a harmful agent
  3. 5. an organism's ability to survive and reproduce
  4. 7. the process by which organisms use the energy in sunlight to form glucose from water and carbon dioxide
  5. 9. the study of embryos
  6. 10. the evolutionary history of a group of organisms
  7. 11. the field of biology that deals with classifying organisms