Stopped slavery . Look it up and it will give more detail
It is helpful because the grid can help pinpoint the exact location on the map.
North where? United States, in general?
Explanation:
The peptidoglycan layers which are present in the gram-positive bacteria are interspersed densely with the anionic glycopolymers that are known as wall teichoic acids or simply, threads of teichoic acid.
These glycopolymers play a very crucial role in the determination of the cell shape, regulation of the cell division, and also other fundamental aspects of the physiology of gram-positive bacteria.
Wall teichoic acids are also important in the process of pathogenesis and play important roles in the antibiotic resistance.