Evolution

2. evolution of one species in response to another
5. animals with bony or cartilaginous backbones
7. adjustment in natural or human systems in response to actual or expected climatic stimuli or their effects
9. Type of evolution in which two or more species that originate from a common ancestor and become increasingly different over time
14. how populations of organisms change over short periods of time, even between one generation and the next

1. Scientist who study ancient life by means of the fossil record
2. Evolution in different lineages of structures that are similar or ‘analogous’, but that cannot be attributed to the existence of a common ancestor
3. Patterns of changes in groups of closely related species over broad periods of geological time
4. [?] Radiation is when single species or small group of species evolve into many diverse forms over time
6. structure which no longer serves a clear function in the organism that possesses it
8. Vertebrate with four true limbs
10. Different species emerged over time due to natural selection.
11. equilibrium isolated episodes of rapid speciation between long periods of little or no change.
12. the preserved remains or impressions of once-living organisms
13. similarity due to common ancestry