Answer:
its the level of acid in substances
you put the amount of a item into a cup and add water.
Explanation:
Your brain sends it signals telling it what you need
The answer is A i believe
The first one is oxygen and then respiration
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.
