Biology Crossword Puzzle

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Across
  1. 4. When a species becomes suited for its environment
  2. 5. a rapid increase in the population of algae in freshwater or marine water systems
  3. 8. Organs of a specie that is no longer in use
  4. 12. variety of life/species on Earth
  5. 13. Ability to reproduce off-spring that are also fertile
  6. 14. When a human chooses a variation of a specific trait and only breeds those organisms to eventually has a pure breed species
  7. 15. The process in which a water body becomes enriched with nutrients, which therefore leads to growth of simple plant life
Down
  1. 1. The developmental stages of an animal while in a egg/uterus
  2. 2. A species on the brink of extinction
  3. 3. When a species changes/adapts to have a better rate of survival or reproduction
  4. 6. Every land mass on earth was once connected
  5. 7. The killing of a whole species
  6. 9. A rock made by already exiting rocks or dead organisms
  7. 10. Animals or plants that become preserved in the rock record of Earth
  8. 11. Bones of a dead organism that has been turned into rock