Species is the lowest taxonomic group in zoology .
the lowest rank was the laborer ,farmer or slave
slaves
the bectrens
Berylium is a non metal element. Atomic number of it is 4.
Beryllium has the lowest atomic mass in group 2 of the periodic table.
Lithium is the element with the lowest atomic number in Group 1 (alkali metals), while hydrogen is the element with the lowest atomic number in Group 17 (halogens) and Group 18 (noble gases).
Probably the slaves.
Xia
The lowest class of people in ancient Egypt were slaves.
Helots
monarchy