At individual level i believe the mechanism of bacteria survival is brought about by the ability of bacteria to survive in extreme conditions such as extreme heat, cold, dehydration, and large amounts of ultraviolet rays. At population level, bacteria can produce quickly and their population grows rapidly.
Bacterium // <span>Not all bacteria are solely </span>pathogens<span>.This one causes food poisioning and is also used for Botox injections.</span>
B.they are excreted and float freely around the body ,hunting infections
A positive D-dimer result may indicate the presence of an abnormally high level of fibrin degradation products. It indicates that there may be significant blood clot (thrombus) formation and breakdown in the body, but it does not tell the location or cause. For example, it may be due to a venous thromboembolism (VTE) or disseminated intravascular coagulation (DIC)<span>. Typically, the D-dimer level is very elevated in DIC.</span>