Digital Communications
One advantage of digital information is that it tends to be far more resistant to transmitted and interpreted errors than information symbolized in an analog medium. This accounts for the clarity of digitally-encoded telephone connections, compact audio disks, and for much of the enthusiasm in the engineering community for digital communications technology. However, digital communication has its own unique pitfalls, and there are multitudes of different and incompatible ways in which it can be sent
For many applications, it would suffice for our needs perfectly. But, it is not the only way to get the job done. For the purposes of exploring digital techniques, we'll explore other methods of monitoring this hypothetical tank, even though the analog method just described might be the most practical.
The analog system, as simple as it may be, does have its limitations. One of them is the problem of analog signal interference. Since the tank's water level is symbolized by the magnitude of DC current in the circuit, any "noise" in this signal will be interpreted as a change in the water level.One of the largest discrepancies concerns aging or other features of organisms that act to restrict life span. Darwin's theory is largely based on "survival of the fittest". If an individual organism has a trait that allows it to survive longer and therefore breed more, its traits are more likely to be represented in descendents. If an individual has traits that limit its survival relative to other individuals, those traits tend to "select out" and be removed from the gene pool. It is therefore impossible, according to orthodox Darwinism, for an organism to evolve a trait that restricts or regulates survival without any compensating individually beneficial effect such as an increase in reproductive capacity