Altruism and Evolution

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Across
  1. 2. to fight in order to keep (someone or something) safe
  2. 8. feelings and behavior that show a desire to help other people and a lack of selfishness
  3. 10. to give up (something that you want to keep) especially in order to get or do something else or to help someone
Down
  1. 1. a person's relatives
  2. 3. to look at (something) closely and carefully in order to learn more about it, to find problems, etc.
  3. 4. to refuse to obey (something or someone)
  4. 5. a group of plants or animals living or growing in one place
  5. 6. to give up the use or enjoyment of (something)
  6. 7. an organism's ability to survive and reproduce in a particular environment
  7. 9. to have or own (something)