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Ancestral species are common on a certain hawaiian island. However, on the islands surrounding it derived species are more common. Does this phenomenon support dispersal or vicariance? Explain.
I think it supports dispersal, because it’s likely that the ancestral species originated on the first island and then through migration moved to the other islands, occupying slightly different niches and conditions and thus becoming different. I don’t think it would support vicariance because if an event broke up all the islands wouldn’t the species be completely different and not derived?

So I’m trying out these practice question for my upcoming test but can’t figure out the answer and can’t find the answers anywhere in the textbook.
What types of natural disturbance play a role in affecting species richness in plant
communities?  Does human caused disturbance mimic ‘natural’ disturbance?
2. What kinds of dispersal traits influence whether a species can colonize a plant
community?
3. Given the effects of disturbance on species richness in this old field community, how
should one manage a forest to maintain native species richness?
4. Can you predict the habitat (or niche) requirements are of exotic species based on
where you found them relative to native old field species?  How do the life history traits
(mode of reproduction, growth rate, amount of offspring produced, seed size) of exotic
species differ from that of native species

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)