JAMB - Biology (2015 - No. 10)
The lowest unit of classification is the
class
genus
phylum
species
הֶסבֵּר
Option D is correct. This is because, species is the lowest unit in the hierarchy of classifying living organisms.See the illustration below.
From kingdom phylum → class → order → family → genus → species
From kingdom phylum → class → order → family → genus → species