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