Unit 8 Review

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