The term BLOB ON A SLIDE is a reference to an AMOEBA, which is a single-celled organism that moves by extending and retracting its pseudopods. It is commonly found in freshwater environments and is often studied in biology classes due to its simple structure and ability to adapt to its environment. The term BLOB ON A SLIDE is used to describe the AMOEBA's appearance when viewed under a microscope, as it appears as a blob-like shape on a slide.