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Verbal·Expression of Ideas·Transitions

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In biology there is no single agreed-upon concept of what defines a species;        numerous competing species concepts are used within the field, a dilemma known as the species problem. The genotypic cluster species concept, described in 1995 by Mallet, defines species in accordance with genetic similarity, while the general lineage species concept, delineated by Queiroz in 1998, organizes species according to evolutionary lineage.

Which choice completes the text with the most logical transition?

A

as a result,

B

for instance,

C

in addition,

D

however,