It protects the spinal cord.
gradpoint homies.
Bacterial cell walls are made of peptidoglycan (also called murein), which is made from polysaccharide chains cross-linked by unusual peptides containing D-amino acids. ... Gram-positive bacteria possess a thick cell wall containing many layers of peptidoglycan and teichoic acids.
I believe the answer to this is Fermentation and anaerobic respiration.
The role of species in an ecosystem, consisting of such things as what it eats, when it eats, and where it lives is niche.
