Advantages Limited and exclusive bipedalism can offer a species several advantages. Zoologists often label behaviors, including bipedalism, as "facultative" (i.e. CHAPTER 8 Facultative bipedalism: only going on 2 feet when you need to Orthograde [trunk]: indicates upright posture Dating methods: Relative – older or younger:-Stratigraphic: analyze order and position of layers of remains and put in geological time scale-Biostratigraphi/faunal correlationc: fossils and their use in dating rock formations. Facultative and Obligate Bipedalism. Facultative: Facultative refers to the ability to live under more than one specific environmental condition. Definition The word is derived from the Latin words bi(s) 'two' and ped-'foot', as contrasted with quadruped 'four feet'. The australopithecines possessed these traits and must have been adapted to arboreal quadrupedal vertical climbing, having the capacity, at the same time, to perform facultative terrestrial bipedalism, moving on the ground in a manner visually identical to that of humans. Types of Cellular Respiration. Obligate: Obligate means to be restricted to a particular characteristic. Obligate Bipedalism: Definition. Advantages. Facultative: Facultative organisms obtain energy from aerobic respiration, anaerobic respiration, and fermentation. Definition. Facultative bipedalism has evolved independently in numerous lizard clades as a consequence of acceleration and changes in BCoM (Aerts et al., 2003; Clemente, 2014). Bipedalism - Definition - Facultative and Obligate Bipedalism. Definition. The position of the BCoM varies depending on the length of the trunk and tail relative to the hip ( Van Wassenbergh and Aerts, 2013 ). Zoologists often label behaviors, including bipedalism, as "facultative" (i.e. Animals, including chimpanzees and gorillas, that assume bipedalism on a temporary basis in order to perform a particular function practice a form of locomotion called facultative bipedalism… Is the discipline of defining groups of biological organisms on the basis of shared characteristics. The word is derived from the Latin words bi(s) 'two (2)' and ped-'foot', as contrasted with quadruped 'four feet'.. Facultative and obligate bipedalism. Bipedalism definition is - the condition of having two feet or of using only two feet for locomotion. Key Difference – Obligate vs Facultative Parasite Parasitism is a kind symbiotic relationship between two organisms in which one is benefited while the other is not. Limited and exclusive bipedalism can offer a species several advantages. 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