Across
- 1. Darwin studied the different beak shapes and sizes of ____________.
- 6. Populations gradually change over time in a process called _________________.
- 9. ____________ ___________ developed the theory of evolution.
- 11. Scientists use comparative ________________ which is the comparison of skeletal structures.
- 14. ______________ is when all the members of a species have died.
- 15. A ____________ is a scientific explanation that is backed by evidence.
- 16. Scientists use ______________ evidence, comparing body structures, to support the theory of evolution.
Down
- 2. ______________ is the study organisms in stages before birth.
- 3. Charles Darwin sailed the world on a ship called the HMS _________.
- 4. The process by which organisms that inherit advantageous traits tend to survive and reproduce more than other organisms is called _______________ ___________________.
- 5. Evolution is when a population changes over time to be better suited to its ______________.
- 7. A natural genetic difference in traits among members of the same species is called a __________.
- 8. A ____________ is a change in the structure or amount of the genetic material of an organism.
- 10. Beak shape is an _______________ as it helps the bird survive in its environment.
- 12. A ____________ is a change in the structure or amount of the genetic material of an organism..
- 13. Charles Darwin was a __________________.