[Answer] Which animal does not have a nervous system?

Step 1 : Introduction to the question "Which animal does not have a nervous system?"

...Although human life would be impossible without a nervous system, some animals, such as sea sponges, have evolved without one. Seen as the most simple form of multicellular animal life, sponges lack nerves and digestive systems and rely on flowing water for food and oxygen.

Step 2 : Answer to the question "Which animal does not have a nervous system?"

Sponge:

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