The answer is b. Linnaeus.
Swedish scientist Carl b. Linnaeus developed binomial nomenclature. Binomial nomenclature is a formal system of
naming species. As the word 'binomial' suggest, a name is composed of two
parts. The first
word indicates the organism's genus classification while the second
word indicates the species within a genus.
Let's for example take species Quercus alba. So, the first word Quercus indicates the genus
in both cases, and the second word alba indicates species within the
genus Quercus.
