The term 'Preservers of Proclivities' refers to the role of genes in preserving certain traits and characteristics from one generation to the next. Genes are the basic units of heredity, and they contain the instructions for the development and functioning of all living organisms. Genes are passed down from parents to their offspring, and they determine the physical and behavioral characteristics of the offspring. In this way, genes act as preservers of proclivities, ensuring that certain traits and characteristics are passed down from one generation to the next.