The tip-of-the-tongue phenomenon also known as lethologica or TOT defines that the lexical access might occur in the different stages. This phenomena is quite common with increasing age.
The individual experiencing this phenomena fails to remember any word or the memory that has occurred in the life. This might also create the feeling that combined with the partial recall. The individual can recall the word immediately if they known the first word.
Ecologists are concerned with the use of mathematical models and systems analysis for the description of ecological processes and for the sustainable management of resources
