Across
- 3. using an animal for a desired trait
- 6. too little oxygen in the water
- 7. process by which individuals that are better adapted for their environment survive longer
Down
- 1. father of evolution
- 2. the struggle among living things to get the necessary amount of food, water , and shelter
- 4. natural process by which something takes place
- 5. scientist who noted that both animals and humans can produce offspring