biology

12345678910
Across
  1. 1. an animal that drinks 20 gallons of water in one go
  2. 4. effects nervous system by drinking to much of it
  3. 7. an allele which expresses itself when present on only one of the chromosomes of a pair
  4. 9. this gas allows you to breath
  5. 10. describes differences between individuals of the same species
Down
  1. 2. an alternative form of a gene
  2. 3. this gas makes protein in plants
  3. 5. this causes tremors and writhing and can lead to dementia
  4. 6. the slow continual change of organisms over a long period of time
  5. 8. contains addictive nictotine and can cause lung cancer