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Reflex arcs are evolved in animals.

1. In animals, the thinking process of the brain is a bit slow.
2. In many animals, specially lower animals the complex neuron network needed for thinking is not there or is not well developed.
3. Hence reflex arcs have been evolved as efficient ways of functioning in the absence of the true thought process.
4. However, in spite of the presence of complex neuron networks, reflex arcs continue to be more efficient for quick responses.