The immune system is a system of many biological structures and processes within an organism that protects against disease. To function properly, an immune system must detect a wide variety of agents, known as pathogens, from viruses to parasitic worms, and distinguish them from the organism's own healthy tissue.he ability of the immune system to respond to pathogens is diminished in both the young and the elderly, with immune responses beginning to decline at around 50 years of age due to immunosenescence. In developed countries, obesity, alcoholism, and drug use are common causes of poor immune function.
Yes, a 32-bit architecture is limited to addressing a maximum of 4 gigabytes of memory. Depending on the operating system, this number can be cut down even further due to reserved address space. This limitation can be removed on certain 32-bit architectures via the use of PAE (Physical Address Extension), but it must be supported by the processor.
Knowing the answer to the last question is increasingly important these days, as you can't run 64-bit software on a 32-bit OS. Likewise, if you do have 64-bit Windows (often referred to as x64), you should always opt for 64-bit versions of your favorite applications (when available). Windows doesn't paste this information anywhere in plain sight, but it's easy enough to find.