Across
- 2. an early stage of developement in an organism, helps scientists recognize similarities in different species
- 5. any feature of an organism that improves its chance of survival and reproduction in an environment
- 7. the remains or evidence of an organism that lived in past ages
- 9. the evolution of a new species from an existing species
- 10. prokaryotes that make food for photosynthesis; responsible for producing oxygen to create our modern atmosphere
- 12. the physical traits of an organism
- 13. the evolutionary history of a group of organisms
Down
- 1. the process by which organisms best suited for their environment survive and reproduce
- 2. the process of change in species and populations of organisms over time; Charles Darwin
- 3. the field of biology that deals with classifying organisms
- 4. a group of similar organisms that can interbreed and produce fertile offspring
- 6. an organism's ability to fight a disease; passive and active
- 8. a drug used to kill or slow the growth of a bacteria
- 11. the mass of gases that surrounds Earth