Assertion: bilateral symmetry | /r/HasProperty | graham et al.
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text: Bilateral symmetry is a product of proper, uninterrupted development and occurs with the formation of two identical traits on either side of a central axis (M0ller and Swaddle, 1997; Graham et al., 2010; Savriama and Klingenberg, 2011; De Coster et al., 2013).