The crossword solution for the term 'POOL FILLERS' is GENES, which is an abbreviation for deoxyribonucleic acid. Genes are the basic unit of heredity and are made up of DNA. They contain the instructions that determine how an organism looks, functions, and passes on its traits to its offspring. Genes are responsible for the physical characteristics of an organism, such as eye color, hair color, and height. They also control the production of proteins, which are essential for the functioning of cells.