A Sea Lemon (Mollusca, Gasteropoda[?], Nudibranchiata[?]) is a flattened oval marine mollusc without shell, which feeds on sponges and other sessile[?] animals. The roughened skin and oval form as seen from above suggest the fruit for which the animal is named (lemon).
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If the discriminant is negative, then there are two different solutions x, both of which are complex numbers. The two solutions are complex ...