Why aren't convenience samples usually representative of the population?

#1) Why aren't convenience samples usually representative of the population?
The answer is because it would not be representative enough. Convenience sampling is a type of non-probability sampling that involves the sample being drawn from that part of the population that is close to hand. That is, a sample population selected because it is readily available and convenient, as researchers are drawing on relationships or networks to which they have easy access. The researcher using such a sample cannot scientifically make generalizations about the total population from this sample because it would not be representative enough.