Final answer:
Organisms can resist high salt levels by actively pump out salt ions or accumulate certain ions in their cytoplasm. Some organisms require high salt concentrations for growth, while others have developed tolerance to salt in their environment.
Step-by-step explanation:
The resistance of an organism to high salt levels can be attributed to various factors. Some organisms have evolved adaptations to deal with high salt concentrations, such as actively pumping out salt ions or accumulating certain ions in their cytoplasm. For example, Dunaliella spp. uses a high concentration of glycerol, and Halobacterium spp. accumulates large concentrations of potassium (K*) and other ions. Additionally, some organisms, like halophiles, require high salt concentrations for growth. Other organisms, like certain staphylococci and micrococci, have developed tolerance to salt in their environment.