Explain the importance of promiscuous binding specificity exhibited by mhc class i and class ii molecules.

It allows cells and antigen presenting cells to present a large range of antigens (in the range if millions) to T cells so there is an appropriate immune response against the invading pathogen or cancer.  This is possible without changing or having many types of MHC complexes.

the answer is true when observing or determining population size, a direct observation is use, in which each organism is counted in a population or in an area. one benefit of this measure is that you get the exact population count but it will take a long time to  determine  the  size  of a  population.