Across
- 6. remains or traces of a once living organism
- 7. the study of development of unborn or unhatched organisms
- 8. when all members of a species die out
- 9. the process of biological change by which populations become different from their ancestors over many generations
Down
- 1. the idea that all organisms share a common ancestral species from which they evolved as some point in the past
- 2. the body structure of an organism and its structural traits
- 3. the history of life on Earth as it is preserved by fossils
- 4. a record of the activity of an organism such as footprints, scratches, and fossilized dung
- 5. happens when an organism's tissues are replaced by minerals from water