Starfish or sea stars also survive without a brain. They have no head, but they do have a nerve ring and nerves extending into each arm, which help them move and respond to their surroundings. Some species can even regenerate a lost arm, and in certain cases, grow an entirely new sea star from part of a limb.
These seven creatures show that life does not always need a brain to survive. Some depend on nerve nets, some on nerve rings, and some on colony cooperation. Their survival shows how nature can build many different solutions for the same challenge. In the animal world, adaptability often matters more than complexity.
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