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		The effect of temperature on the embryonic development of sea urchins (Lytechinus variegatus) Bryan Graye and Laura Carballo Franklin & Marshall College and Swarthmore College 2001, 2004 Objective: This experiment aims to discover if temperature has an effect on the rates of sea urchin embryonic development. By altering the external environment, the experiment will determine if temperature will affect the length of the first and subsequent cell cycles upto the pluteus larvae stage. Figure 1. Normal fully developed sea urchin, Lytechinus variegatus.