Us: Past and Future

12345678910111213141516171819202122232425
Across
  1. 3. a characteristic or behaviour of a species that allows it to survive and reproduce more effectively
  2. 5. the study of the embryos of different species
  3. 8. resistance when microbes evolve mechanisms that protect them from the effects of medicines
  4. 10. dating a method of dating rocks and minerals using radioactive isotopes
  5. 12. time scale a scale showing the history of life and geology
  6. 14. an early type of animal or plant from which others have evolved
  7. 18. an animal of a large group distinguished by the possession of a backbone or spinal column
  8. 21. the time it takes for half of a radioactive sample to decay
  9. 22. to insecticides a heritable change in the susceptibility of a pest population to a particular insecticide, or insecticide group
  10. 24. pressure forces such as the weather, the predators or the food source that affect an individual living in that environment
  11. 25. selection the process by which individuals with favourable traits are 'selected' by nature
Down
  1. 1. limbs a limb with 5 digits
  2. 2. of species geographic limits of a particular species' distribution is its range, often represented as shaded areas on a map
  3. 4. fossil when a part of the organism such as a skeleton is preserved and remains in its original form
  4. 5. for evolution fossil records, embryology, geography, and molecular biology supporting the theory of evolution
  5. 6. Darwin The scientist to write the theory of evolution in 1859
  6. 7. the preserved evidence in rocks or soils of organisms that were once alive
  7. 9. forms a fossil or organism that downs the intermediate state between an ancestral form and that of it's descendants; also known as a 'missing link'
  8. 11. fossil any indirect evidence left by an organisms; for example footprints or faeces
  9. 13. film when the dead body partially decays and leaves a thin black deposit of carbon
  10. 15. anatomy the study of features of different species to look for evidence of a common ancestor
  11. 16. fossil when a part of the organism is changed into another mineral
  12. 17. structure a part of an organism that has lost some or all of its original function
  13. 19. of biological evolution organic life on our planet has changed over long periods of time and continues to change by a process known as natural selection
  14. 20. different forms of the same element with different numbers of neutrons, and so different atomic masses
  15. 23. fossils fossil that can be used to compare the relative age of rock strata in different locations