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Verbal·Standard English Conventions·Boundaries

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A single specimen of the marine protist B. digitata collected in the South Atlantic in 1879 served the vital role of reference organism for all        specific organisms as representative of an entire species for the purposes of taxonomical identification is critical, according to biologists, to resolving uncertainties that arise when classifying new specimens.

Which choice completes the text so that it conforms to the conventions of Standard English?

A

B. digitata, identifying

B

B. digitata identifying

C

B. digitata and identifying

D

B. digitata. Identifying