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ACROSS:
7. study of the development of organisms that shows common ancestry, such as limb buds on a snake (10 letters)
14. type of evolution that involves a symbiotic relationship involving two unrelated species that depend on one another (11 letters)
16. structure similar characteristics due to common ancestry, such as bones in the limbs of tetrapods (10 letters)
19. structures that no longer have a function but are reduced forms, such as human appendix (9 letters)
20. type of evolution when two distantly related species develop similar characteristics, often because they have similar niches (10 letters)
21. theory that evolution occurs at a slow and steady pace (10 words)
DOWN
2. the process by which isolated populations of the same populations develop different characteristics (10 letters)
3. goosebumps are an example of this type of adaption (13 letters)
5. process by which those characteristics that permit survival and reproduction are continued and eventually replace less advantageous characteristics. ( 16 letters)
6. population numbers become very low then rebound, resulting in a change in allelic frequency. ( 10 letters)
9. process of dispersal, adaption, and subsequent speciation (17 letters).
15. random and permanent change in the DNA of an organism (8 letters)