Heredity

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Across
  1. 2. Forests are natural __________ of animals.
  2. 6. Natural disaster that can wipe out a whole population.
  3. 8. Building block of the human body is called ________.
  4. 11. ____________ contaminates the natural environment.
  5. 14. Tree has ___________ , green leaves and flowers.
  6. 15. ____________ is the young butterfly.
  7. 16. Each type of living things has different physical _______________.
  8. 17. At risk of no longer existing means to be __________.
  9. 18. There are many types of _________ things.
Down
  1. 1. A snake has no ___________.
  2. 2. The passing of characteristics from parents to their offspring is called _______________.
  3. 3. __________ is the young frog.
  4. 4. We can save animals by creating ______________ centers.
  5. 5. Heredity is present in ___________ of living things.
  6. 7. The nucleus contains genes.
  7. 9. _________________ are so small that we cannot see them without microscope.
  8. 10. Inside the cell there is a structure called ____________.
  9. 12. ______________ can lead to the decline and extinction of fish.
  10. 13. A squid has _________________ to swim.