Across
- 5. A very slow change happening on a species over long period time.
- 6. Existence of many different kinds of living things in an environment.
- 7. Age approximation technique stating that fossils found on the upper rock layers are younger than fossils found on the deeper rock layers.
- 8. Body parts in different species having different structure but the same in function.
- 9. Preserved remains of remains of living things existed thousand to billions of years ago.
Down
- 1. A scale that shows the major events in the Earth’s history. It also shows the appearance of various kinds of organisms in a particular period of time on earth.
- 2. Process of checking the amount of radioactive carbon-14 in the fossil to know its age.
- 3. Body parts in different species having the same internal structure but different in function.
- 4. A method of determining evolutionary relationship of different species by comparing their body parts and functions.