词汇精练——zoologists

Many zoologists believe that it was because so many ecological niches were available with virtually no competition from existing species. Will zoologists ever know the evolutionary sequences in the Cambrian explosion? Perhaps another ancient fossil bed of soft-bodied animals from 600-million-year-old seas is awaiting discovery.
The word " zoologists " is closest in meaning to which of following?
A special in animals
B scientists
C artists
D biologists

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