chemistry and zoology crossword

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Across
  1. 1. animals need it to survive
  2. 3. fuels living things
  3. 4. ocean dwelling animals that swim
  4. 6. What animals do after being in a certain area for a while
  5. 9. element with 99 protons
  6. 12. true or false wolfs can mate with coyotes
  7. 13. a biological macromolecule
  8. 15. coyote wolf hybrids
  9. 18. and uneven amount of protons and neutrons
  10. 20. animals that fly and have feathers
Down
  1. 2. the amount of protons in an element
  2. 5. the amount of protons and neutrons in an element
  3. 7. and uneven amount of protons and electrons, positive or negative charge
  4. 8. building block of all elements
  5. 10. conducts heat and electricity
  6. 11. a bond between two elements that contain 4 electrons
  7. 14. tried to steal the baby buffulo from the lions
  8. 16. Carbon, hydrogen, oxygen, nitrogen, phosphorus, sulfer
  9. 17. zoology is the study of what?
  10. 19. living things that have tissues and organs