Across
- 4. ancient species from which two or more species evolved
- 5. organism with one line of symmetry drawn down the middle to create two identical halves has __________ symmetry
- 8. organism with many lines of symmetry has ____________ symmetry
- 9. earliest stage of an organism's development
Down
- 1. study of the development of unborn organisms
- 2. organism with no lines of symmetry is ____________
- 3. process of biological change over generations
- 6. body structure and structural traits
- 7. closest living relative to a whale