[Solved] In a(n)___________________ research design,there is a baseline and a treatment phase and,in the treatment phase,there are different criterion levels for the behavior. Microscopic Organisms: Tiny life forms, often unicellular, that are not visible to the naked eye and require a microscope to be observed. Mass Extinction: Mass Extinction is an event in which a significant, widespread, and rapid decrease in the biodiversity on Earth occurs, often due to catastrophic environmental changes. Extinction Event: A significant, widespread, and rapid decrease in the biodiversity on Earth, often characterized by the disappearance of a large number of species in a relatively short period. Molecular Phylogeny: The analysis of the evolutionary relationships among organisms using molecular data, such as DNA or protein sequences.