It seems that you have missed the necessary options to answer this question, but anyway, here is the answer. The cell walls of bacteria contain the material PEPTIDOGLYCANS. This is the <span>substance forming the cell walls of many bacteria, consisting of glycosaminoglycan chains interlinked with short peptides. Hope this answer helps.</span>
<span>In a ecosystem,rocks are an example of an abiotic factor because they are not a living part of the environment. From context of the statement, an abiotic factor is the non-living part of the environment in a ecosystem.</span>
