Reptiles

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Across
  1. 3. / mating system in which the female has more than one male mate
  2. 4. / Time period where reptiles originated
  3. 7. / Type of fertilization of eggs
  4. 8. / How reptiles warm up their bodies
  5. 9. / muscle under the lungs to aid in breathing
  6. 11. / To depend on external source for heat
  7. 12. / What reptile scales are made of
Down
  1. 1. / way that reptile offspring are born in which females lay eggs which hatch outside of their body
  2. 2. / Only known snake to live past the Arctic Circle (two words)
  3. 5. / mating system that increases the males reproductive fitness
  4. 6. / a reptile that is going extinct due to habitat loss (two words)
  5. 10. / help to retain moisture and prevent skin damage