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