science

1. which of the following must occur for speciation to take place?
a. a population must be physically separated into groups
b. harsh environmental conditions must be imposed on a population
c. competition must occur between members of a populations
d. some event must occur leading to two or more groups within a population that cannot interbreed**
2. which of the following is true if species a and species b have more shared derived characteristics with eachother then they do with species c?
a. species a and b are not related to c
b. species a,b an c do not have any common ancestor
c. species a an b are more closely related to one another than either is related to species c***
d. species a and b can interbreed with one another but not with species c
3. in a cladogram a branch point represents an ________ and a branch that ends without leading to a living species represents _______?
a. common ancestor; extinction
b. mutation; puctuated equilibrium
c. extinct species; common ancestor
d. common ancestor; speciation**

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  1. 1. A
    2. C
    Not sure about three. All of these answers are in my opinion.

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  2. Of course 3 would be A

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  3. I thank you for your input. I see it now.

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