Across
- 2. As time goes on, the amount of Carbon-14 in a dead organism will decrease at a constant rate. Since we know that rate, we can tell how long ago the organism died. This is a specific type of direct dating.
- 5. These scientists study how humans have changed biologically over time (2 words).
- 6. These scientists study how living organisms change over time. They do their studies using comparative anatomy (comparing the physical structure) of organisms (2 words).
- 8. Useless structures passed down from a distant ancestor.
- 9. Erect-walking primates that include modern humans, earlier human species, and early humanlike species
- 10. Scientists who investigate biological change by studying fossils and the history of life. They study rock strata (stratigraphy) to determine the age of fossils or events
- 12. The major evidence of biological change over time. These are evidence of past life that have been preserved in rock layers
Down
- 1. A significant increase in the rate of extinction of multiple species over a short period of geological time. There have been 5 in Earth’s history, and we may be experiencing a 6th.
- 3. These scientists study the stages of growth & development of living organisms from fertilized egg to adult (2 words).
- 4. Type of dating that uses the radioactive decay of an element to determine exact age. Also called Direct Dating.
- 7. Type of dating that uses the position of the fossil or event in the rock strata (oldest at the bottom, youngest at the top). This does not involve any actual numbers. Also called Relative Dating.
- 11. Structures that have similar characteristics (organs/bones) in different organisms that suggest common ancestry.