Across
- 1. body part that has lost its original function through evolution
- 6. body parts that perform a similar function but differ in structure
- 8. fossil that has characteristics of both ancestral organisms that evolved later
- 9. chart that divides Earth's history into different time units based on rock changes and fossils
Down
- 2. the science of the development of embryos from fertilization to birth
- 3. body parts of organisms that are similar in structure and position but different in function
- 4. study of similarities and differences among structures of different species
- 5. record of all of the fossils ever discovered
- 7. event that occurs when the last individual organism of a species dies