Heine, 2011). In developmental psychology Essentialism has emerged as an important concept in psychology, particularly developmental psychology. Gelman and Kremer (1991) studied the extent to which children from 4–7 years old demonstrate essentialism. Children were able to identify the cause of behaviour in living and non-living objects. Children understood that underlying essences predicted observable behaviours. Participants could correctly describe living objects' behaviour as self-perpetuated and non-living objects as a result of an adult influencing the object's actions. This is a biological way of representing essential features in cognitions. Understanding the underlying causal mechanism for behaviour suggests essentialist thinking (Rangel and Keller, 2011). Younger children were unable to identify causal mechanisms of behaviour whereas older children were able to. This suggests that essentialism is rooted in cognitive development. It can be argued that there is a shift in the way that children represent entities, from not understanding the causal mechanism of the underlying essence to showing sufficient understanding (Demoulin, Leyens & Yzerbyt, 2006). There are four key criteria that constitute essentialist thinking. The first facet is the aforementioned individual causal mechanisms (del Rio & Strasser, 2011). The second is innate potential: the assumption that an object will fulfill its predetermined course of development (Kanovsky, 2007). According to this criterion, essences predict developments in entities that will occur throughout its lifespan. The third is immutability (Holtz & Wagner, 2009). Despite altering the superficial appearance of an object it does not remove its essence. Observable changes in features of an entity are not salient enough to alter its essential characteristics. The fourth is inductive potential (Birnbaum, Deeb, Segall, Ben-Aliyahu & Diesendruck, 2010). This suggests that entities may share common features but are essentially different. However similar two beings may be, their characteristics will be at most analogous, differing most importantly in essences. The implications of psychological essentialism are numerous. Prejudiced individuals have been found to endorse exceptionally essential ways of thinking, suggesting that essentialism may perpetuate exclusion among social groups (Morton, Hornsey & Postmes, 2009). For example, essentialism of nationality has been linked to anti-immigration attitudes(Rad & Ginges, 2018). In multiple studies in India and the United States, Rad & Ginges (2018) showed that in lay view, a person's nationality is considerably fixed at birth, even if that person is adopted and raised by a family of another nationality at day one and never told about their origin. This may be due to